high beams went out - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 11-22-2009, 01:56 AM Thread Starter
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high beams went out

i was out last night, did a little off roading. went over a hill and my headlights turned off. i had my high beams on at the time and when i switched them back the lights went on. so, my high beams went out. is there a wire or fuse that i can check for that?

Garrett






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post #2 of 10 (permalink) Old 11-26-2009, 10:54 PM
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If this is your first headlight incident, then welcome to the "1st Gen H/L Blues Club". Your H/L switch will be partially fried, but with luck the block terminal that plugs into it won't have melted. The remedy involves fuses and relays under the hood to protect either your new switch or the toggle switches you've installed in lieu thereof. I won't go on until I hear you want it, or nobody else chimes in with links to the DTR sticky, ....

1993 D350 dually, Getrag, abt 450,000+ miles, mostly stock except for electrics management
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post #3 of 10 (permalink) Old 11-26-2009, 11:34 PM Thread Starter
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what? its that much work? well, i like my high beams but not that much. post the info that you do have, i might keep this one.

Garrett






BRING BACK THE OLD TDG!
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post #4 of 10 (permalink) Old 11-27-2009, 01:24 AM
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Originally Posted by SSpeeDEMONSS View Post
what? its that much work? well, i like my high beams but not that much. post the info that you do have, i might keep this one.

Garrett
Here's a link to a DTR sticky :: http://www.dieseltruckresource.com/d....html?t=176263

that's the cadillac version of the job, .... I did mine much more simply before I ever found DTR but Jim Lane does just first-class work in all his write-ups. Have a look-thru then we can get down to the "for Dummies" version. ..

1993 D350 dually, Getrag, abt 450,000+ miles, mostly stock except for electrics management
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post #5 of 10 (permalink) Old 11-29-2009, 08:16 AM Thread Starter
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yeah, ive seen Jim's truck. wow!

that is A LOT of work for the dang headlamps.

Garrett






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post #6 of 10 (permalink) Old 11-29-2009, 05:13 PM
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Quote:
Originally Posted by SSpeeDEMONSS View Post
yeah, ive seen Jim's truck. wow!

that is A LOT of work for the dang headlamps.

Garrett

Lucky you, ... I'd pay admission to have a close look at Jim's rig, ...

1993 D350 dually, Getrag, abt 450,000+ miles, mostly stock except for electrics management
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post #7 of 10 (permalink) Old 11-29-2009, 06:19 PM Thread Starter
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Quote:
Originally Posted by Denman View Post
Lucky you, ... I'd pay admission to have a close look at Jim's rig, ...
yeah, it was definitely VERY clean.

ok, so whats the simple way to do the headlights.

the whole idea about the relays and wiring harness is to use the stock headlight socket as the trigger and power the bulbs with the relay power? i think i can figure that out. though i dont understand why my high beams are out but my regular ones are fine still.

Garrett






BRING BACK THE OLD TDG!
oh well, i have a map to the darkside

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post #8 of 10 (permalink) Old 11-29-2009, 08:19 PM
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Originally Posted by SSpeeDEMONSS View Post
yeah, it was definitely VERY clean.

ok, so whats the simple way to do the headlights.

the whole idea about the relays and wiring harness is to use the stock headlight socket as the trigger and power the bulbs with the relay power? i think i can figure that out. though i dont understand why my high beams are out but my regular ones are fine still.

Garrett

Hey Garrett, ... My bet is that your H/L switch has partly burnt, and you can verify that by going to the H/L socket and trying to run a test light with the hi beam side. If true, then just add power via a separate switch and relay. However I'd try to save the other H/L functions in the OE switch by running them with relays too (ie lo beam and tail lights). Cab inside lights and instrument lights don't seem to burn out the OE hook-up. Soooo, again at H/L socket, follow the lo-beam wire back a foot or so, cut the wire and crimp female connectors on the two ends. Plug the socket side one onto the load spade of your relay (#87). Plug the other female connector to the "trigger" spade of your connector (#86). Now grab some fused power off the (+) battery post and run it to the relay power spade (#30/51). Lastly run the remaining spade (#85) to any convenient ground. The other relays go in exactly the same, varying only in what you do with the load terminals (#87) of the relays. Since there's gonna be 3,4 or 5 relays once the relay frenzy is done, it may be wise to pick an open space under the hood and mount the relays in a line, identified with paint-pen or the like. Jim used relay sockets instead of female connectors, and I much prefer that, but until I read his sticky I didn't know they were around. I will be upgrading my relays to sockets soon as I find some altho my relays have run very well for about four years now (well neatness counts!), .... good luck with it
...

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post #9 of 10 (permalink) Old 11-29-2009, 08:26 PM Thread Starter
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i have an upgraded headlight harness already. i just remembered that. i guess im going to have to use a test light or a voltmeter and get in there and check things.

Garrett






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post #10 of 10 (permalink) Old 12-08-2009, 07:54 PM Thread Starter
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i figured it out. i finally looked at the harness and there was a relay missing. luckily i had one in the glove box. replaced it and its all good again.

Garrett






BRING BACK THE OLD TDG!
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