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Old 03-28-2012, 12:57 PM   #1
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1993 Coachmen chassis/house power help! :(

1993 Coachmen, 24 foot, E350.

While installing another item, it seems as though the power going to my radio no longer works (the 12v power wire) Just for testing purposes, I put the power wire from the radio to the 12v 'memory' port (for the radio's clock, etc) and it came on. So at least I know the radio and the ground wire work.

The radio worked before i installed a different device earlier in the day. Here's the thing: I looked through Ford owner manual at the fuse section and tried to see which 'category' that would fall under. One said 'radio/instrument lights' but the instrument lights are on. So I went through the entire fuse box (next to brake pedal) one by one and they are all fine.

I look at the diagram for the fuses under the hood and nothing sounds like it would be radio or house power. I have yet, however, due to the pain in the butt it is to reach, checked any of those fuses yet. I noticed that when it was working before I messed with things, you can turn the radio on without the key. So it looks as though it is originally wired to go off of the house battery. I know this since when I turned the house battery disconnect switch off, the radio wouldn't work. If so, is there a fuse under the hood that has something to do with the house battery supplying power to a wire under the dash for random devices?

I have a trip this weekend, and even though I have the radio going off of the chassis battery temporarily, I'll have to watch it so I get stuck somewhere.
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Old 03-28-2012, 10:59 PM   #2
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I did know that the radio worked with the key off but I didn't know that hitting the house battery disconnect killed power to it so I agree that it must come off the house distribution panel. Are there any other DC loads that aren't working? Check your house dist panel fuses(mine is right under the kitchen sink). You should have the AC breakers on one side and the DC fuses on the other side. Good luck.
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Old 03-28-2012, 11:18 PM   #3
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Many radios have a fuse right on the back of the radio 'box' itself. Also, trace the 12v wire back to it's source, there might be an inline fuse in the red wire. My rv has a switch on the dash to switch from chassis to house batteries. Do you have one of those?
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Old 03-29-2012, 02:17 AM   #4
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BTW, What was the other item you installed and where exactly were you working to install it? Might be easier to figure out what happened to the radio if we knew this additional info.
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Old 03-29-2012, 09:12 PM   #5
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I was doing some work in the MH today and decided to pull house fuses to see if any powered the radio and low and behold the second one I pulled killed the radio. On mine the fuse that powers the CO detector and a bedroom light also powers the radio. So should be a pretty easy fix for ya.
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