Power isn't getting to the slideout controllers

[spd3001]

I was supposed to be on my way down to Disneyland today but I can't get my slideouts to retract. I'm going in circles here and need help.

The vehicle is a 2021 Thor Vegas 27.7 Class A motor home.

My slideouts were working fine yesterday, both on shore power and the generator. Today they aren't and no power is getting to the controllers. Things that I've done since yesterday is to change oil and air filter on my onan qg 4000 generator. It's running fine and the 30 amp circuit breaker on the side of the generator is set. I also replaced my pair of 12V coach batteries as the pair in there weren't holding their charge. The 100 amp breaker there is fine as is the fuse in the fusible link on the batteries. All of the fuses in the power center are fine and all of the circuit breakers have been reset even though none were tripped. The fusible link in ther slideout controller is fine as well.

So I don't know what to check next. The Thor site's electrical manual is too generic. I don't really see any where else I should be looking for power.

I have a replacement power center converter that i was going to put in when I change to lithium/lead phosphate batteries. Should I go ahead and swap it in. It will work fine with the lead acid baterries I just installed.

 

[Beau388]

I was supposed to be on my way down to Disneyland today but I can't get my slideouts to retract. I'm going in circles here and need help.

The vehicle is a 2021 Thor Vegas 27.7 Class A motor home.

My slideouts were working fine yesterday, both on shore power and the generator. Today they aren't and no power is getting to the controllers. Things that I've done since yesterday is to change oil and air filter on my onan qg 4000 generator. It's running fine and the 30 amp circuit breaker on the side of the generator is set. I also replaced my pair of 12V coach batteries as the pair in there weren't holding their charge. The 100 amp breaker there is fine as is the fuse in the fusible link on the batteries. All of the fuses in the power center are fine and all of the circuit breakers have been reset even though none were tripped. The fusible link in ther slideout controller is fine as well.

So I don't know what to check next. The Thor site's electrical manual is too generic. I don't really see any where else I should be looking for power.

I have a replacement power center converter that i was going to put in when I change to lithium/lead phosphate batteries. Should I go ahead and swap it in. It will work fine with the lead acid batteries I just installed.

Power for the slide's controllers comes from the 30 amp fuse in the power center It goes from there to the controllers. With no shore power or generator power. Do the interior lights and the ceiling fan work? Make sure the Use/store latching relay is in the use position (master power-on).

 

[16ACE27]

I was supposed to be on my way down to Disneyland today but I can't get my slideouts to retract. I'm going in circles here and need help.

The vehicle is a 2021 Thor Vegas 27.7 Class A motor home.

My slideouts were working fine yesterday, both on shore power and the generator. Today they aren't and no power is getting to the controllers. Things that I've done since yesterday is to change oil and air filter on my onan qg 4000 generator. It's running fine and the 30 amp circuit breaker on the side of the generator is set. I also replaced my pair of 12V coach batteries as the pair in there weren't holding their charge. The 100 amp breaker there is fine as is the fuse in the fusible link on the batteries. All of the fuses in the power center are fine and all of the circuit breakers have been reset even though none were tripped. The fusible link in ther slideout controller is fine as well.

So I don't know what to check next. The Thor site's electrical manual is too generic. I don't really see any where else I should be looking for power.

I have a replacement power center converter that i was going to put in when I change to lithium/lead phosphate batteries. Should I go ahead and swap it in. It will work fine with the lead acid baterries I just installed.

Was everything connected correctly?

As Beau said, you need 12 VDC power from the house battery buss to operate the slides.

You also need your slide interlock to be met. For your model year that MAY mean the engine running. But you also need to make sure the interlock circuitry (and power supply) is working.

 

[spd3001]

Yes, with no shore power and no generator lights come on.

 

[spd3001]

Lights and fans work fine with no shore power or generator.

 

[spd3001]

Everything was connected the same when I put in the new batteries. I used photos to ensure I did. The problem was there before I put in the new batteries, whether with shore power or generator.

 

[spd3001]

Was everything connected correctly?

As Beau said, you need 12 VDC power from the house battery buss to operate the slides.

You also need your slide interlock to be met. For your model year that MAY mean the engine running. But you also need to make sure the interlock circuitry (and power supply) is working.

This rv uses a BMPro computer in lieu of switches. When I go to retract the slideouts, it tells me it can't because it senses the engine is running.

 

[spd3001]

This 2021 Vegas has a computer running a BMPro application that controls all the coach's functions in lieu of hardware switches. The attached image is of the relay and fuse panel that's colocated with the slideout controller for slideout #1. I haven't been able to find any map with a layout labeling what each of these are for. I'll probe this and see if I can figure this out from there.

 

[spd3001]

Just found out that the image is a Bussmann box and it's for the dash not the controller. Is there something similar somewhere for the coach?

Yes there is. it's called the RVMasterNode. It's part of the RVMaster BMPro controller that Thor's using these days. Now I just need to find the damn thing. From what others have found, there's probably a wiring issue.

 

[PS89]

Hold off any any other changes until this problem is solved. you don't want to accidentally introduce a potential new problem that will compound your frustration.

You also need your slide interlock to be met. For your model year that MAY mean the engine running. But you also need to make sure the interlock circuitry (and power supply) is working.

What Ted said...

When I go to retract the slideouts, it tells me it can't because it senses the engine is running.

I think this tidbit is the clue to follow. My guess is that your coach is wired so that the ignition switch must be in the OFF position to satisfy the safety interlock and allow the slide controller to be operational. First thing to do, if that is the design, is to make sure the ignition switch is OFF.

After that, it's going to be necessary to see how the BMPro RVMasterNode detects the ignition status. Probably a hardwired input to the module. The Thor schematic should give you a page with all the inputs and outputs identified. I don't have a '21 schematic available but I do have the '20 version at hand. Probably the same but not positive.

I suspect that, in an extreme pinch, disconnecting the chassis battery *might* fool the BMPro and allow the slide controller to operate.

As for where Thor hid the darned thing, maybe another owner can point you to it. Otherwise, give the support folks at Thor a call and see if they can help out.

 

[John & Diane]

Have you tried starting the engine and shifting through the gears and and then shutting it off in Park. If that doesn't doesn't help try turning it off in Neutral. One of my kids had a car that a sensor on the trans went bad and until that was fixed the car would only start in neutral. Also on our MH the parking brake has to be on for the slides to work.
Good luck.

 

[PS89]

Have you tried starting the engine and shifting through the gears and and then shutting it off in Park. If that doesn't doesn't help try turning it off in Neutral. One of my kids had a car that a sensor on the trans went bad and until that was fixed the car would only start in neutral...

Completely different situation. Thor does not use the transmission range sensor for anything. They do use an ignition feed, though, for signalling or enabling/disabling certain sub-systems.

 

[16ACE27]

This rv uses a BMPro computer in lieu of switches. When I go to retract the slideouts, it tells me it can't because it senses the engine is running.

That would have been good to know in your first post.

 

[Skip500]

This rv uses a BMPro computer in lieu of switches. When I go to retract the slideouts, it tells me it can't because it senses the engine is running.

Does the parking brake need to be set? Have you tried starting the unit, seeing what theBmpro tells you and then shut it off and see what you are being told?

 

[Skip500]

Wonder if they found the problem and what the fix was?

 

[dkoldman]

Wonder if they found the problem and what the fix was?

Fly by, he may be at Disneyland by now with slide out.

I can't imagine the logic of a design that prevents the slide from coming in just because the engine is running or it thinks the engine is running. It is like having a garage door that requires you to enter the code to close the damn door.

I don't agree with it but at least you could cite some reason for not allowing the slide to extend if the engine is running.

 

[spd3001]

Solution Found!

Solution Found!

Okay, this was "easy" to resolve once I spent an hour and a half on the phone with a lovely woman at Thor. We learned there was a single elusive Bussmann shortstop 30 amp circuit breaker somewhere that was inline and would prevent current flowing to any of the slideout motors if it had been tripped (see attached image.)

At first we thought it might be between the battery box and the power center. Looked at everything in the battery box and under the vehicle looking for it. Not there.

I had been testing the RV Master Node to verify it was getting the 12 VDC it required to operate (and it was.) To do that, I had the lid off the area beneath the bed where the RV Master Node was found. Drawings indicated the breaker might be co-located with the Master Node but it wasn't.

The woman helping me found someone at Thor who knew where the drawings were that were used on the shop floor. He found the ones for the 2021 Axis/Vegas 27.7 and reported that the circuit breaker would be found BEHIND the power center that was located beneath the closet and drawers on the driver's side of the hall. I removed the power center (after verifying the battery connection and all other power was off) and sure enough there it was.

I removed the breaker and found it would not reset, i.e. it was an open circuit. I went down to an auto parts store and found a suitable replacement, installed it and the slideouts retracted when asked to do so.

Of note, the circuit diagram showed it to be a 30 amp fuse but the one that was installed by Thor was a 50 amp fuse. It was mechanical so it required a human to reset it even though it was hidden behind the power center. I replaced it with a 40 amp breaker which was the highest amp rating available from the auto parts store. The one I replaced the original with is also an auto reset breaker. It has a bi-metallic strip that deforms when overtemp due to high current that automatically resets when it cools.

I ordered a replacement that matched the original that I can put in when I replace the power center when I install my Lithium/Lead Phosphate batteries.

So I put everything back together by 2:00 PM on Monday and we made it down to Orangeland RV Park in Anaheim by 9:30 that evening. By 10:00 AM Tuesday morning we were in the park enjoying the holiday festivities.

 

[spd3001]

BTW, on the 2021 Thor Vegas 27.7 the ignition must be off to move the slideouts.

 

[The Rookie]

Solution Found!

Okay, this was "easy" to resolve once I spent an hour and a half on the phone with a lovely woman at Thor. We learned there was a single elusive Bussmann shortstop 30 amp circuit breaker somewhere that was inline and would prevent current flowing to any of the slideout motors if it had been tripped (see attached image.)

At first we thought it might be between the battery box and the power center. Looked at everything in the battery box and under the vehicle looking for it. Not there.

I had been testing the RV Master Node to verify it was getting the 12 VDC it required to operate (and it was.) To do that, I had the lid off the area beneath the bed where the RV Master Node was found. Drawings indicated the breaker might be co-located with the Master Node but it wasn't.

The woman helping me found someone at Thor who knew where the drawings were that were used on the shop floor. He found the ones for the 2021 Axis/Vegas 27.7 and reported that the circuit breaker would be found BEHIND the power center that was located beneath the closet and drawers on the driver's side of the hall. I removed the power center (after verifying the battery connection and all other power was off) and sure enough there it was.

I removed the breaker and found it would not reset, i.e. it was an open circuit. I went down to an auto parts store and found a suitable replacement, installed it and the slideouts retracted when asked to do so.

Of note, the circuit diagram showed it to be a 30 amp fuse but the one that was installed by Thor was a 50 amp fuse. It was mechanical so it required a human to reset it even though it was hidden behind the power center. I replaced it with a 40 amp breaker which was the highest amp rating available from the auto parts store. The one I replaced the original with is also an auto reset breaker. It has a bi-metallic strip that deforms when overtemp due to high current that automatically resets when it cools.

I ordered a replacement that matched the original that I can put in when I replace the power center when I install my Lithium/Lead Phosphate batteries.

So I put everything back together by 2:00 PM on Monday and we made it down to Orangeland RV Park in Anaheim by 9:30 that evening. By 10:00 AM Tuesday morning we were in the park enjoying the holiday festivities.

What in incredibly Thor place to put a manual breaker.
I’m glad you got this figured out!

 

[dkoldman]

Solution Found!

Okay, this was "easy" to resolve once I spent an hour and a half on the phone with a lovely woman at Thor. We learned there was a single elusive Bussmann shortstop 30 amp circuit breaker somewhere that was inline and would prevent current flowing to any of the slideout motors if it had been tripped (see attached image.)

At first we thought it might be between the battery box and the power center. Looked at everything in the battery box and under the vehicle looking for it. Not there.

I had been testing the RV Master Node to verify it was getting the 12 VDC it required to operate (and it was.) To do that, I had the lid off the area beneath the bed where the RV Master Node was found. Drawings indicated the breaker might be co-located with the Master Node but it wasn't.

The woman helping me found someone at Thor who knew where the drawings were that were used on the shop floor. He found the ones for the 2021 Axis/Vegas 27.7 and reported that the circuit breaker would be found BEHIND the power center that was located beneath the closet and drawers on the driver's side of the hall. I removed the power center (after verifying the battery connection and all other power was off) and sure enough there it was.

I removed the breaker and found it would not reset, i.e. it was an open circuit. I went down to an auto parts store and found a suitable replacement, installed it and the slideouts retracted when asked to do so.

Of note, the circuit diagram showed it to be a 30 amp fuse but the one that was installed by Thor was a 50 amp fuse. It was mechanical so it required a human to reset it even though it was hidden behind the power center. I replaced it with a 40 amp breaker which was the highest amp rating available from the auto parts store. The one I replaced the original with is also an auto reset breaker. It has a bi-metallic strip that deforms when overtemp due to high current that automatically resets when it cools.

I ordered a replacement that matched the original that I can put in when I replace the power center when I install my Lithium/Lead Phosphate batteries.

So I put everything back together by 2:00 PM on Monday and we made it down to Orangeland RV Park in Anaheim by 9:30 that evening. By 10:00 AM Tuesday morning we were in the park enjoying the holiday festivities.

Great news!! Thanks for coming back to post the outcome.