Quote:
Originally Posted by 16ACE27
How did you test them? Did you use a load tester? Did you check the battery bank voltage with a voltmeter when you had 7 VDC at the inverter?
People are trying to help you but we can't read your mind. The more complete your information is, when you answer questions, the better our information is in guiding you in your troubleshooting. Remember the phrase GIGO?
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I wrote a long reply over the weekend but for some reason it didn't post as I thought. I've re-written it here - I do appreciate the help and apologize for not being clear earlier.
First step was to remove the batteries from the coach, verify the water levels were correct and fully charge the batteries. I then tested the specific gravity of each cell and they all passed. I have NOT load tested the batteries as I don't have a load tester but that's on my shopping list this week.
Anecdotally all of the 12V systems seem to work fine (other than the inverter) and I am not getting any low voltage errors when running the levelers. Slide-outs and drop down bunk are working as expected when not plugged into shore power.
I ran the tests that Judge recommended and can verify the BIM is working. I'm getting charging voltage when plugged into shore power and when the engine is running.
Batteries are now re-installed. I disconnected the inverter and measured the voltage at the cable ends that power it. When not connected to the inverter the voltage there is 12.6V. The same measurement as at the battery terminals.
I then re-connected the cables to the inverter and measured the voltage at the input terminals of the inverter. Result is 7"ish volts. I walked around to the battery bay and measured the voltage at the battery terminals as well as on the downstream side of the fuse - these all measure 12.6V. Essentially it appears that 12.6V is arriving at the inverter but once it is connected something internal is malfunctioning.
With regard to the plugging and unplugging of shore power, I did this because when I plug shore power in there is an audible "click" from the inverter and when this all started it was because the battery charge had dropped and the inverter kept clicking over and over. I did notice that after plugging and unplugging shore power something was changing as the voltage at the input terminals would bounce from 7'ish to 11'ish volts.
(edited to mention) I did notice that power to my fridge and the outlet in the passenger computer desk routes directly through the inverter. With the unit uninstalled I had to tie the AC input to the romex that comes out of the inverter to those locations. Otherwise I have no power, even on shore power.
I'm really open to coaching here - what am I missing in my steps?
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