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Old 10-29-2020, 10:21 PM   #1
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Brand: Thor Motor Coach
State: Ohio
Posts: 6
THOR #17205
headlights don't work

2017 Thor Challenger 37TB. Problem started on the way back from Florida last March. Noticed the daylight running lamp indicator being flakey, not consistent. After 6 months of trying to diagnose the problem, I have learned this. Headlights don't work when emergency brake is off. hear crackling sound like bacon frying coming from fuse panel below and left of steering column, when the multifunction switch(turn signal switch) is in the bright light position. Have replaced the two relays down there. didn't help. When the emergency brake is on, like when you are parked. the lights work. has something to do with the daylight running lamps. ?? has anybody had this problem. Somebody Help Me. PLZ.
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Old 10-30-2020, 06:14 AM   #2
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Brand: Thor Motor Coach
Model: Damon Daybreak
State: New Mexico
Posts: 156
THOR #19133
Almost sounds like a bad ground.
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Old 10-30-2020, 05:31 PM   #3
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Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 393
THOR #8139
Greetings
+1 on a loose ground, check around the ebrake pedal, cable and the wiring harness going to fuse block.

You could get lucky, bad grounds are always the hardest trouble to find.

First test would be push ebrake till it clicks 1 time, check lights then a couple more clicks check lights, repeat till the lights come on. All of this with your head under the dash...look and listen.

Welcome to the forum
Good luck, keep us updated.
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Old 10-30-2020, 10:36 PM   #4
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Brand: Thor Motor Coach
Model: Damon Daybreak
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THOR #19133
Ebrake applies a ground when engaged, and that ground is probably backfeeding the headlight circuit.
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Old 10-31-2020, 01:08 PM   #5
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Brand: Thor Motor Coach
State: Ohio
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THOR #17205
headlights don't work

problem goes away with the first click of the ebrake. tried just leaving it in that first click position, no brakes are applied yet at this point, but the "ebrake on warning" does come on at the first click.

So what kind of a ground should I be looking for? black wire to something metal?
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Old 10-31-2020, 01:16 PM   #6
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Brand: Thor Motor Coach
State: Ohio
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THOR #17205
headlights don't work

so getting down there in the floorboard between the doghouse and the driver's chair is almost impossible, I may remove the doghouse to get more access? is that a mistake, may put some of that sound/heat insulation on the bottom side of the doghouse while I have it off. is that worthwhile?
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Old 10-31-2020, 01:19 PM   #7
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Brand: Thor Motor Coach
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THOR #17205
headlights don't work

anybody know where I could find a schematic of the headlight / daylight running lamp wiring diagram.
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Old 10-31-2020, 01:39 PM   #8
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THOR #16471
Quote:
Originally Posted by bradmachine View Post
anybody know where I could find a schematic of the headlight / daylight running lamp wiring diagram.
A little older model with a similar problem, but a start... 2014 Challenger
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Old 11-09-2020, 02:42 AM   #9
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THOR #17205
found the problem, yes it was a loose ground. inside the engine compartment on the right side.
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Old 11-09-2020, 02:43 AM   #10
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THOR #17205
on the right side if facing the engine. directly in front of the steering column.
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Old 11-09-2020, 03:47 AM   #11
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THOR #19133
Good find, and thanks for letting us know.
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Old 11-11-2020, 07:41 PM   #12
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THOR #1018
When I had a headlight problem it was a ground wire on the frame drivers side under the hood.
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