Headlight wire harness

[Rex3]

Working on the headlights on my 99 gmc, plow was removed along with the wiring harness (wires cut). Question is it looks like the low and high beam have 2 wires each on the connector but there are 5 wires in the oem harness that is cut. I have the schematic but not very good with electrical. Anyone have a picture of how these wires should be wired to the connecors? Would it be better to get a used harness from a junkyard? Thanks

[richard wysong]

I would go with a used harness and that way if you splice it in the connections will be under the hood more protected from the elements

[Rex3]

Thanks Richard, that's exactly what I'm going to do. Stopped at the junk yard after work and cut the harness out. Thanks for the reply. 

[richard wysong]

I'm in the middle of replacing the whole engine trans harness on my 98. not having any fun but it was too damaged to repair after getting wrapped up in the front driveshaft while plowing.the stupid bracket thats supposed to hold the harness out of the way broke damaging the switch and the electrical plug on the trans tearing the op switch off the engine etc when it wrapped up. big snow storm coming Saturday ,don't think its gonna make it, have to work tomorrow

[Brenden Burnham]

13 hours ago, richard wysong said:

I'm in the middle of replacing the whole engine trans harness on my 98. not having any fun but it was too damaged to repair after getting wrapped up in the front driveshaft while plowing.the stupid bracket thats supposed to hold the harness out of the way broke damaging the switch and the electrical plug on the trans tearing the op switch off the engine etc when it wrapped up. big snow storm coming Saturday ,don't think its gonna make it, have to work tomorrow

Ugh sounds frustrating.  Sorry to hear.

[dna9656]

So should those that plow (or 4 X 4 off road) "Harden" or make "bullet proof" the wiring exposed under the engine/along side the transmission as part of the plow install? Sounds like guys like you (that have gone through it) will (would) make sure that the wiring gets moved up as high as possible. I would also get that plastic split conduit and put the wires inside that (just like the OEMs) do to protect that stuff. This will save you from having to do it in the cold in your drive or other unheated possibly wet place or taking it to a shop who will charge you full price for half the effort and quality you would give the job. Man, I hate that!

When I was in retail auto repair (PEP BOYS) I worked on everything like that. Probably why the let me go after 5 weeks.... I had my own customers, they would ask for me by name to be the mechanic that work on their vehicle. I shot the flat rate book right in the backside. Oh well, so they fired me; I was looking for work when I got there.

[richard wysong]

I tried to locate a NOS harness with no luck so thought I was going to have to spend hours in the boneyard taking 1 out so I was calling around trying to find the right truck as it only fits 98 according to GM parts.com but 1 yard put it on their locator and it came back in seconds. I had it shipped to me and it was in great shape all the conduit intact and no cut wires. the only thing I have found different so far is the plugs for the upstream 02s and the harness are both female so I'm going to change the sensors instead of splicing the  harness. the biggest challenge is sorting out which pigtail goes where and how it was originaly routed  but I'm getting there. I had to remove the trans mount to get enuff clearance between the back of the engine and the firewall to fish the wires down to the trans. we are getting a blizzard here tomorrow and this will be the first storm that the truck won't plow since it was new.