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Old 06-25-2018, 08:32 PM   #1
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Holiday Rambler Panel lights

I have a 2005 Holiday Rambler. It is blowing the panel lights fuse. I have replaced the headlight switch and he Allison vehicle interface module. Still no panel lights. When I measure from the out side of the fuse that blows it is going directly to ground. 2 ohms. I cannot figure this one out.. Has anyone had this problem before? And help would be greatly appreciated
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Old 06-26-2018, 05:57 AM   #2
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Your ohm check (wire hot to ground) is not really a valid test because you can still read continuity to ground through the bulb filament. So a wiring short to ground may read the same as a normal circuit when the bulbs are plugged in. You would need to remove the all panel bulbs to confirm.

When you say "panel" are you talking about the dash lights?

You said you replace the headlight switch so that eliminates that as the problem.

I would unplug the wiring harness to headlight switch and then see if the fuse blows. That will help narrow down the location of short (before or after headlight switch).

Are there any other lights on this circuit (like step lights, dome, reading lamps, or is it just the dash panel)?
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Old 06-26-2018, 05:34 PM   #3
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Quote:
Originally Posted by krr1101 View Post
...When I measure from the out side of the fuse that blows it is going directly to ground. 2 ohms...
Two ohms, at 12.6 volts is going to be about 6.3 amps. That's about 80 watts. There are a lot of small bulbs in that circuit (all the switches have bulbs, all the gauges, the radio, HVAC head, and so on. What size is the fuse you're installing? I suspect your resistance measurement is off, it is difficult to get accurate low ohm readings with many meters today. You need an excellent ground connection and a good connection to the circuit. (And a good meter with good leads, too!)

Diagnostics are basically to start shedding loads and using a test light instead of a fuse (I'd suggest a 20 watt bulb) start getting rid of various circuits as you can. Watch for drastic drops in current draw. Don't forget the switches by the copilot's seat, and door...
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Old 06-26-2018, 06:09 PM   #4
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The fuse is a 10 amp. When I disconnect the harness to the headlight switch it does not blow. It does not blow if I hook up the harness and do not turn the the park lights on. Of course it does when I turn the park lights on. It does not blow when I disconnect the vehicle interface module. I will try the test light and try disconnecting lamps.
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Old 06-26-2018, 06:11 PM   #5
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Dome lights are on this switch. But they work. Even with the fuse blown.
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Old 06-27-2018, 10:17 AM   #6
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So you know the problem is "after" the headlight switch (not the wiring from fuse to headlight switch). If you leave headlight switch plugged in and unplug VIM, does the fuse blow? If no, that eliminates the VIM from being th issue.

The thing that bothers me, is that you have a 10A fuse powering the Parking lights. That doesn't sound right. Typically it would be a circuit breaker or at least a 15 A fuse. Generally the Parking light and Dash Panel lights are on different circuits (different fuses).

Can you remove the parking light bulbs (front and rear) and try again. Does the fuse blow with the bulbs removed? I'm wondering if the Parking light circuit (wire) is shorted to the panel light circuit.

Also, the fuse that is blowing - is this in a factory fuse panel? If yes, what are the other fuses labeled (is there on for Parking Lights, Brake Lights, ect., like you would see in a car)?
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Old 06-27-2018, 10:33 AM   #7
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Originally Posted by krr1101 View Post
The fuse is a 10 amp. When I disconnect the harness to the headlight switch it does not blow. It does not blow if I hook up the harness and do not turn the the park lights on. Of course it does when I turn the park lights on. It does not blow when I disconnect the vehicle interface module. I will try the test light and try disconnecting lamps.

Pull the bulbs out of the parking lights and clean the sockets, maybe corrosion problem.
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Old 06-28-2018, 08:26 AM   #8
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Hope you find the circuit problem!

Good luck, happy trails, and God bless!
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