Obs 4 Headlight Mod 88-98

[Guest Riggs]

1. Mount A Relay On The Inside Fenderwall By The Battery

2. Run a wire (Green) from #87 to the low beam wire

3. Run a wire (Black) from #85 to a good ground with a self tapping screw or a straight to the negative battery terminal

4. Run a wire (White) from #86 to the high beam wire

5. Run a wire (yellow) from #30 to the + side of the battery with an inline fuse.

6. Tape up your connections and zip tie the wires.. test it out first though.

 

This works to cover the headlights on 88-98 OBS trucks.

 

The Relay just needs to be a 30 Amp Relay...

 

The wires are very easy to find since the only two wires running to the low bulb and high bulbs..... and the black is ground so you just need to know that the low beem is on the out side and the highs are on the inside of the grille.

 

I also put a simple two prong switch in so i can turn it off if i would ever need to for some reason....

 

here is a couple picture of my Setup:

 

 

[merlin5577]

I have this exact same mod. I bought the kit from painless performance from summitracing.com. Only difference I can see is the power supply for mine is off the alternator, where I believe the one for yours is off the battery. It is a very nice mod for night time and it helps out a lot.

[Guest Riggs]

oh idk it only cost me $5 for the relay and i got the wire and connections and used tools for free from work... so i saved about $15

[thecraft]

I'd have to say this is the most useful mod you can do to the 88+ trucks for under $20.

 

I ran my power wire to one of the auxiliary posts in the main fusebox, though.

 

[Edit] What do you need the switch for? Just pull out the fuse.

[Guest Riggs]

idk, just to have it i guess lol....

[dietz4ibanez]

I'd have to say this is the most useful mod you can do to the 88+ trucks for under $20.

 

I ran my power wire to one of the auxiliary posts in the main fusebox, though.

 

[Edit] What do you need the switch for? Just pull out the fuse.

 

 

I did that to my truck and it made he high beams so much brighter with the help of the low beams...

[L29er]

I can`t beleive i still haven`t done this to my truck...

[97SierraGMC]

would it be better to have power off the alt or the battery?

[thecraft]

 

 

would it be better to have power off the alt or the battery?

It doesn't matter, battery is fine.

[97SierraGMC]

yea i just redid mine today... took me about 1 hour to do just because i did everything with wire loom and liquid tape. so it looks nice and will last a really long time.

 

i made a post on the Tech Wiki as well

 

http://www.gm-trucks.com/forums/index.php?...icle&id=743

[97SierraGMC]

and while i was under there today i also updated that puny/weak screw for the battery to fender ground. and put in a 0/1 gauge on top of the two factory grounds with a nice bolt