Anyone done a headlight brightener? You know the relay thing....
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
i was thinking the exact same thing when i notice it a couple weeks ago. according to the diagrams it is actually a 20 gauge but that is still pretty week compared to the 16 gauge they used on my 81 from the factory
Last edited by crazzywolfie; Mar 4, 2013 at 04:18 PM.
Captain
Joined: Apr 2012
Posts: 608
Likes: 2
From: Olympic Peninsula, Wa.
My diagram is showing 20 gauge on them as well, and when I put a meter to them, I am only getting 12.1 volts while running. My harness appears to be in great shape. Im very excited for this mod.
As wolfie said, mine is a '78 W350.
As wolfie said, mine is a '78 W350.
Last edited by Scooter78; Mar 5, 2013 at 08:07 AM.
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Captain
Joined: Sep 2012
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I say go for it! It is fun to do as it is easy if you have a working knowledge of DC electronics like I do and it makes a huge difference for the low dollar cost. PLUS you can go to a different H4 headlight housing and brighter lamps as well so get even more light out of the truck.
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Captain
Joined: Sep 2012
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Update, still working perfectly and after driving it a few times at night, what a difference! WHITE BRIGHT light compared to a couple candles behind the glass. I am getting some housings that take H4s and are a way more effecient and better pattern plus some 80~110 bulbs. Now that my wiring will support it and am getting a high amp alternator, a 140a job.
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
glad they are still working good for you. do you know what alternator you currently have? only reason i ask is i think they offer 3 different alternators in 91 and i think they are all interchangeable. 75/90/120amp. only reason i mention this is because i know that sometimes those bit higher amp alternators cost a bit more and rock auto lists the 75 amp alternator for about the same price as the 120 amp alternator.
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
should say on the alternator. there should be a tag on it. i think it should say something like family 75hs, family 90hs or family 120hs. not really sure since i only have a 75 and 90 amp alternator. could also try looking up the part numbers on the tag.
