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05-16-2020, 04:20 PM
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#1
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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Headlights not switching to bright.
Drove our 2107 Tiffin Phaeton for the first time near dark, and at first I didn’t think my headlights were working at all. But they appear to be on dim all the time.
The Bright/Dim switch does nothing and the Bright stays illuminated all the time. I’m pretty sure they are on dim though because they do not seem very bright.
Looked for a fuse, but could not find one. There maybe a relay on the back of the breaker panel?
Bad Bright/Dim switch? Bad relay (if there is one)?
Many thanks!!!
__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:24 PM
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#2
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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Grounds and/or fogged lens.
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05-16-2020, 04:34 PM
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#3
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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Thanks, but the lenses are not fogged. Is there a relay behind the breaker panel?
__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:36 PM
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#4
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:37 PM
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#5
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:39 PM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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Look for a bad or loose ground wire coming from the lights. If they lose the ground, the bulbs run in series, at 1/2 volts.
Start at the lights and follow the harness. There should be a chassis ground coming off It, to a bolt into steel.
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05-16-2020, 04:43 PM
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#7
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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Quote:
Originally Posted by Machine99
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This chart is for the house side of your unit. You need the chassis fuses/circuit breakers. And yes, headlights use circuit breakers. But check grounds first.
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05-16-2020, 04:53 PM
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#8
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:54 PM
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#9
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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I found the chassis fuse box, but to not see a relay or breaker for headlights.
__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 04:55 PM
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#10
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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Trying to trace ground wires, but haven’t found anything loose yet.
__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 05:02 PM
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#11
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,755
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Are you sure the "bright / dim" switch isn't referring to the instrument panel lighting? Check the turn signal lever to see if pulling it toward or away from you doesn't control the high and low beam lights.
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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05-16-2020, 05:10 PM
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#12
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Senior Member
Join Date: Jul 2012
Posts: 2,565
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Quote:
Originally Posted by Machine99
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The 3 squares are relays. I am sure 1 is for the fuel pump, 1 should be for the headlights and not sure what the 3rd is. They are the same and could be swapped for trouble shooting your problem. I did that with a fuel pump problem just to see. Pump was going but swapping the relay extended it till I got a new pump, then the pump failed. Just a thought. I don't throw parts at anything till I figure it out.
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05-16-2020, 05:17 PM
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#13
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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LETMGROW wins the prize! I wasn’t pulling on the turn signal hard enough!
Mystery solved! Thanks!
Still not sure what the Bright/Dim switch does. Doesn’t seem to affect the dash lights either and cannot change it to dim. Oh well, the headlights were the concern.
Thanks again!
__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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05-16-2020, 05:19 PM
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#14
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Senior Member
Join Date: May 2018
Location: Knoxville, TN
Posts: 142
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__________________
2017 Tiffin Phaeton 36GH "Charlie"
2018 Jeep Wrangler Sport "TomTom"
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