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Old 08-04-2022, 03:37 AM   #21
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THOR #26829
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Originally Posted by OldWEB View Post
You need a schematic or wiring diagram or someone that has an idea where the wire is from, beyond my knowledge.
All I can SUGGEST is to bare the two ends of a short piece of wire and jam it into J4 #8 and the other end into the wire of connector J5 #3; That way the wire is fused at 5 amps and if the brown wire circuit is faulty (J4 #8 - grounded) it will only blow a 5A fuse (F28). Jumpering this should pick up relay K1 when the ignition is "on".



This is ONLY a suggestive idea, something I would do (or similar) to keep going down the road. You do need Thors/Freightliners help with a schematic.
We're going to Sturgis tomorrow for at least a week. When I'm safely parked I will try the jumper if I can't find the root cause of the no power issue in the wire bundles. Thanks.

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Old 08-04-2022, 10:57 AM   #22
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Good luck, drive safe and enjoy the bike rally... something I never did make it to in my riding years.
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Old 08-04-2022, 01:47 PM   #23
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Good luck, drive safe and enjoy the bike rally... something I never did make it to in my riding years.
Hey thanks! Should be fun, lots to see around there too. I'll update this post if and when I resolve my electrical issue.
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Old 08-08-2022, 02:40 PM   #24
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THOR #26829
Quick update for those interested. Took a few days breather to run some errands.

I re-seated the ignition switch plug, but no change. Still no voltage at J4 pin8.

Talked to Freightliner and Thor. Didn't get much new info. Got a vehicle interface schematic from Freightliner, which makes no sense to me. The fuse control boards are on backorder from Thor, 4 weeks out.

I think I can get a multi meter probe angled in behind the ignition switch to check voltage heading to the accessory relay. I'm at least hoping the red wire is from the battery.

If I get brave I'll try the jumper if all else fails.
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Old 08-08-2022, 03:17 PM   #25
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Got a vehicle interface schematic from Freightliner,...


You able to share that?
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Old 08-08-2022, 04:14 PM   #26
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This is what I got.
Attached Files
File Type: pdf FREIGHTLINER G66-01574________________-_.001.PD.pdf (166.7 KB, 4 views)
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Old 08-08-2022, 04:30 PM   #27
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Thanks for the update, hope you find it soon
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Old 08-08-2022, 07:57 PM   #28
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This is what I got.
Not the print you want... Only hint I see here is where they mention a 20A fuse (F1-1), so if you can look at your chassis fuse panel(s) to see if you can find a "acc'y" fuse. Check the chassis owner's manual.
Oh, and the acc'y wire should be pink in color.


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Old 08-08-2022, 08:27 PM   #29
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While awaiting a reply, I looked over the connector wires and found an interesting thing. Only the arrow-ed items are wired in. NO CB radio! Also the "Jacks" fuse goes no where... guess that is why they still work!
I would highlight the diagram and maybe even pull the fuses that are not used... leave a note on the diagram that they are not wired in. It would help in the future when hunting down a problem. The other connectors could be done this way also.





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Old Today, 05:14 AM   #30
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Thanks for all your help. My wife has lovingly encouraged me to resolve this issue ASAP!

I'm taking my rig to Freightliner in Rapid City, South Dakota on Friday. They were kind enough to squeeze me in. I'll have them check all the Freightliner components and hopefully rule out the chassis stuff.

Stay tuned.
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Old Today, 04:08 PM   #31
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Well good luck and have a safe drive!


See if you could also "squeeze" some of the schematics out of them, they would help you in the long run. I find very few prints online.
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