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Old 03-25-2014, 03:23 PM   #1
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No power to coach unless RV is running

OK,
I have a really weird electrical problem in my 2005 Itasca Horizon 40AD. I just put the batteries back in after winter, and now I am getting no 12V power to the coach unless the RV is running.

Here are the symptoms:
- no 12V power to coach unless the RV is running
- if the RV is running the battery disconnect switch works
- if the RV is running the battery disconnect switch does not work
- If I plug in the motorhome, the inverter starts humming but I get no power
- If I go in the motorhome and turn on the inverter, I do get 110V power
- the generator does not start (does not even turn over)

Here's what I've done so far:
- cleaned all the connections to the coach battery and confirmed that there is power to them
- I checked the 12V coach fuses under the bed
- I checked the 12V chassis switches outside by the drivers front
- I checked and there is 12V power going in to the inverter

I am running out of ideas. Does anyone have any thoughts?

Thanks,

Darryl
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Old 03-25-2014, 03:29 PM   #2
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If everything was working when you took the batteries out you may have some connection problems when you installed them. Go over the wiring set up for the batteries again.
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Old 03-25-2014, 03:30 PM   #3
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Hooked up the batteries incorrectly blowing the reverse polarity circuit breakers allowing only vehicle generated power to operate????
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Old 03-25-2014, 03:34 PM   #4
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Quote:
Originally Posted by trackman View Post
If everything was working when you took the batteries out you may have some connection problems when you installed them. Go over the wiring set up for the batteries again.
That was my initial thought as well . . . but I can't find anything wrong. . .
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Old 03-25-2014, 03:35 PM   #5
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Hooked up the batteries incorrectly blowing the reverse polarity circuit breakers allowing only vehicle generated power to operate????
What's a reverse polarity circuit?

I did check the main fuse by the batteries and its fine:
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Old 03-25-2014, 03:44 PM   #6
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Not that this will help solve your current problem...but just a tip for the future:

Now that smartphones have put a camera with us all the time, I don't take anything apart before I snap a picture of it. That way, when I am going back together with it later, I don't have to second guess if I am hooking it up right!

Good luck with your 12v issue!

Terry
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Old 03-25-2014, 04:03 PM   #7
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Is your Aux Battery switch on the dash turned on?

Your post is a bit confusing in this area:

"- if the RV is running the battery disconnect switch works
- if the RV is running the battery disconnect switch does not work"

Which is it?

The humming from the inverter when you plug in is most likely the charger portion working, trying to charge the house batteries.

The big fuse shown in post #5 above is in the feed line to the inverter.

It really sounds like you are not getting any power from your house batteries; that's why the generator won't start. Try using the Aux Start switch and see if the generator will start.

If everything is wired up correctly, you need to run a capacity test on the house batteries.

When you get it figured out, please post your solution here. Thanks!
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Old 03-25-2014, 07:08 PM   #8
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OK.

Took all the batteries out. Then scrubbed all the wires. Low and behold some !@#$ had painted (at least I think its paint) one of the red wires black. So it was simply a problem with it being connected incorrectly.

Thanks for everyone's help.
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Old 03-27-2014, 02:01 PM   #9
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Thanks for posting the solution.
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Old 03-27-2014, 08:33 PM   #10
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Quote:
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OK.

Took all the batteries out. Then scrubbed all the wires. Low and behold some !@#$ had painted (at least I think its paint) one of the red wires black. So it was simply a problem with it being connected incorrectly.

Thanks for everyone's help.
A good lesson on why you should never just look at the color of the cables. There are a lot of diagrams explaining how to hook them up.
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