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all4onhi question

kev2809

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Oct 28, 2019
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hey guys!  new to the forum.  just got me a 2002 cladded 4x4 from my buddies auction with only 125k on the clock!  was wrecked along the driver side.  just got it back from body shop and finishing it up..cant wait to start driving it!  it seems to be in really nice shape!

but anywho...while putting everything back together i couldnt get the low beams to work at all.  after verifying fuses and relays and even bought a new dimmer switch and bulbs..still nothing. i get power to the plug with the dimmer switch turned on. i came across the all4onhi mod and figured id give it a go while waiting for turn signal assembly to come in (also read on here that could be the problem).  i grounded the driver side yellow wire and they both work...i ran an inline fuse holder with a 15amp just to be safe.  my question is....what causes the lows to go out in the first place?  and should i just leave the light mod in and not even swap the turn signal switch?  i can return it no problem...but im curious to see if that was the problem anyways.  but after installing..i dont think i can return it (it being electrical part).  im guessing grounding the yellow wire bypasses the ground somewhere and of course you get the all 4 on highs mod as a bonus...i just want to make sure its safe bypassing it like this just to make them operable.  im taking it for inspection next week sometime so i had to get them working one way or another.

 

Vaeagleav

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Since you mention inspection you may want to contact your inspection station to see if the "all 4 on hi mod" is legal in your area?
 

kev2809

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good point..i live in texas so unsure....but tbh ive never even noticed that low beams turn off when flashing highs  lol.
 

kev2809

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well  quick update..went ahead and installed the turn signal assembly and unplugged my ground for all4hi mod just to see if it work.  aaaaand it doesnt.  only way my low beams come on is if i ground the yellow wire for the mod 
 

kev2809

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Oct 28, 2019
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anyone?  this is getting annoying...went to take the truck to get inspected and now the low beams wont turn on at all.  ive checked all relays and fuses under the hood...new dimmer switch.....new turn signal assembly.  still no low beams. 
 

kev2809

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Oct 28, 2019
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well then...in case anyone has this problem check this thread.  https://www.gm-trucks.com/forums/topic/44244-no-low-beam-headlights-intermittent/

this was my exact problem...replaced the connector on the yellow wire named in the link i posted..in the underhood fusebox and all is well.  (it was burned up)
 

frito

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Thanks for posting the answer to help any others that might encounter this issue.  (y)
 
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