4 Hi (Headlights)

[KitRacer]

So for many years I have wired in to the Chevy wiring harness a relay that turns on when the hi beams turn on that turn the low beams back on. That was until I tried to do it on my girlfriends 2002 fullsize last night. Has anyone found out the trick to these trucks without blowing fuses. The low beam bulbs gets some funky readings on the multimeter when the hi beams come on. Also, does anyone know where a safe place to tie in a relay on the hi beam circuit that alows me to run some offroad lights that trigger with the hi beams. I guess it would be the same wire. Oh yeah, and I refuse to buy the painless wiring kit because I was doing this long before their kit was released, and because I dont like doing things the easy way. Thanx for any help

Eric

[johnnyweb]

my guess would be there is not enough amprage to run both bulbs at ones. as far as the offroad lights go all you need is a small trigger wire off the high beam wire to your relay. i have not done this to a chevy before but should work like a ford.

[KitRacer]

There isnt enough amperage to run two bulbs at once, thats why i use the relay to power the lows....

[hoeker]

it should be easy to wire a relay into the high beam circuit to turn on auxilary lights.

running the low beams with the highs may require 2 relays, one for "normal" low beam operation, and one for operation with the high beams. this may not work with the large amount of computer controls in the newer trucks. the painless kit sounds like the way to go.

[tkr]

Which fuse are you blowing? Looking at the diagram, when the headlight switch is on, there is power to both high and low beam bulbs. The headlamp dimmer switch applies ground to either the high or lows depending on the position of the switch. So it looks like you should use the relay to supply ground to the low beams, not power.
I seems like it would also be easy to use the ground supplied to the high beams by the dimmer switch to ground a relay coil for your aux. lights.

[johnnyweb]

my mistake i didnt catch the relay part of the low beam problem on your post. my guess on the weird low bulb reading would be some sort of feed back threw the light switch? or factory relay? i have never tried to mack them work at ones only made fog lights or offroad lights come on in low or high beam positions. good luck!

[jwfab1]

I know it may look backwards at first, but remember its a negative switched circuit on the 99+ models.

I mounted the relay on the passenger side, between the headlight and the parking light, behind the grill, there is a 10mm screw.. this works pretty good.
1. run#86 on the relay through a black wire to the purple highbeam wire that plugs into the headlights
2.run#87 through a green wire to the yellow lowbeam wire
3.run #85 through a white wire and a ninline fuse to the orange high beam wire
4.run #30 through yellow wire to a good ground
5. use the tape and zipties to clean it up.


Jason