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Old 05-27-2016, 12:26 PM   #1
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Headlights not working right

1984 Coachmen President 33 454. the head lights do not work right. 12.3 volt power to the headlight sw./dimmer sw and to the headlight's but the HI beam's do not light up they just glow like a bad ground. I have cleaned ALL grnd to the frame, I have connected the ground wire straight to the batt. grnd. and still nothing. I can jump the light bulbs and they light up OK connect back inline and nothing. I have ran power straight from the batt to the dimmer sw. and still no HI beam's. Does anyone have any hints?
thanks Noel

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Old 05-27-2016, 02:33 PM   #2
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I'd hook up a separated jumper wire from a good ground to the head light fixture to see if it could be the ground wire or connectors on it. You also gave voltages to the dimmer and head light switch, what's the voltage to the plug on the head light lamp? Often dim lights are due to inadequate wiring or too long a run for the wire gauge.

12.3 v is I hope a reading with engine off, the alternator should provide more voltage than that.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-28-2016, 09:14 AM   #3
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The headlight bulbs share a common ground for high & low beam , so if the low beam works properly, the ground should be good.
You've tested the bulbs high /low direct from power and their ok .
Now in your testing have you back probed the wiring at the back of the lights when the high beams are on and just glowing , to see what the voltage is then.
It only takes milli-amps to get a reading on a volt meter, bad contacts in the headlight switch ; or a relay if your system has them; could provide the power to get a meter reading yet not pass the amps required to get the light working properly.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 05-28-2016, 11:07 AM   #4
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Headlight's not working

Thank's to both Skip426 and Bflnn181. a few month ago I had the MH in the shop for engine work. they did not tell me they replaced both Hi and Low Light Plugs to the right headlights and wired them wrong so it was back feeding. changed the wires and all is well.
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light, lights

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