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01-14-2025, 11:01 AM
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#1
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Junior Member
Join Date: Jun 2023
Posts: 17
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Diplomat headlight switch
Headlight and marker lights work, but instrument cluster and dash switches do not. Pulled switch out and went to parts store and got a replacement. Put it back in and now everything works, but after 10-20 seconds the headlights will go out, rest of lights still work. Shut switch off for few seconds and headlights will come back on. Thought maybe a relay, but swapped the fog light and headlight relay and same thing. Plugged old switch back in and headlights will stay on, but just not instrument cluster lights. Any ideas?
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01-14-2025, 11:59 AM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 34,185
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The headlight switch used by various coach builders were originally from GM vehicles of the 70s. I'll try and find a picture and post it .
This type of switch has an internal circuit breaker and it sounds like the one you purchased is defective ; particularly since the new switch has a different issue than the original.
EDIT : Found a picture ; Chevy headlight switch .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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01-14-2025, 11:59 AM
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#3
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Senior Member
Join Date: Oct 2016
Posts: 1,835
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Good morning Dillman31; Don't be surprised that a brand-new part right out of the box can be defective. It's possible. Sounds like the rheostat for the dash lights was bad and that is common. Not 100% sure but remembering that in the headlight circuit might have a circuit breaker that resets if there is too much of an amp draw in that circuit. I think it is in the headlight switch! You might want to try a different headlight switch from a different manufacture to see if you have better luck. If not, you might need to check the amp draw on the headlights. I would also check the grounds in that circuit as a bad ground would lead to a high amp draw. Hope this gets you going and good luck!
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01-14-2025, 12:34 PM
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#4
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,825
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Could be a bad (new) switch.
Friend replaced his and handed me one so I could replace mine. Had to fix it before installation.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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01-14-2025, 12:57 PM
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#5
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Junior Member
Join Date: Jun 2023
Posts: 17
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OK thanks guys. That is what I was leaning towards as well but was reluctant to spend another $30-$40. Guess I'll run down to Napa and try a different one tonight. Keep you posted.
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01-16-2025, 02:11 PM
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#6
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Junior Member
Join Date: Jun 2023
Posts: 17
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Update. Bought a 2nd new switch from Napa and everything is back to normal. 1st one from Carquest was junk out of the box
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01-16-2025, 04:14 PM
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#7
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,825
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Glad you got it fixed.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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