98 s10 rear chassis harness to taillight harness questions..... - S-10 Forum
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98 s10 rear chassis harness to taillight harness questions.....

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Old 01-16-2012, 03:58 AM   #1
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98 s10 rear chassis harness to taillight harness questions.....

Cann you guys help me match up the wires.

I have 7 wires on the chassis wiring harness at the rear on the drivers frame rail .
and i have a 5 wire connecter for the tail light harness.


heres the chassis harness - 7 wires
light green - connected to taillight harness light green
dark green - connected to taillight harness dark green
yellow - connected to taillight harness yellow
brown - connected to taillight harness brown
brown with white stripe. - connected to taillight harness brown w white
Black - connected to chassis ground (frame rail)
Light blue - Not connected




and heres the taillight harness 5 wire connector, and a ground splice pack (green thing.)
light green - connected to chassis harness light green
dark green - connected to chassis harness dark green
yellow - connected to chassis harness yellow
brown - connected to chassis harness brown
brown with white stripe. - connected to chassis harness brown w white
splice back - 4 black wires coming in 1 black wire running to chassis ground (frame rail)

Anyone know what the light blue chassis wire is???

Aanyone know if i have my grounds/ and wiring all correct??

Thanks !!!!! and look at the wires not the rust
Old 01-22-2012, 12:00 PM   #2
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Have you figured out what the light blue wire is for?
I have been having troubles with my tail lights and I have found the same wire not connect and don't see a place for it either.

Thanks!!
Old 01-22-2012, 12:09 PM   #3
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Lt Blue is for "Trailer Wiring Provision" comes from the 10A trailer CMCSL fuse.
Old 01-23-2012, 05:35 PM   #4
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Re: 98 s10 rear chassis harness to taillight harness questions.....

ok sounds good.

Does the chassis harness black (ground) connect to the frame rail?

or does it tie into the taillight harness (green ground splice pack)
Old 01-23-2012, 07:16 PM   #5
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Re: 98 s10 rear chassis harness to taillight harness questions.....

My guess is the black wire is for a trailer wiring provision; is already attached to the chassis on the other end.

All the grounds from the bulbs go to a splice pack which itself is grounded.

So this wire would be so you can have something grounded to hook your trailer to.
Old 01-24-2012, 10:29 AM   #6
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Black wire in chassis harness should be grounded to frame as well as the wire from the ground block. In my case, the chassis harness ground was for the fuel pump (among other items). In general, ALL black wires are grounds.
Old 12-13-2012, 09:04 PM   #7
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Hey in the above picture of the "taillight harness 5 wire connector, and a ground splice pack (green thing.)"I need the metal pieces that go on the wires that go into the connector (not sure what to Actually call them), does anyone know where i can get them? Oreillys, Autozone, and Advance all say that they don't exist. -.-
Old 12-15-2012, 10:51 PM   #8
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Terminals? The metal inside the white plastic? I think you have to improvise.

Really you can probably buy the white connector with six or eight inches of wire on it from the dealer. And make standard splices to connect it to your harness.
Old 02-14-2013, 06:08 PM   #9
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Sorry to high jack this post.

I have a question on the green harness section in the above pic with 4 wires and another ground off to the side?
What's that for?

Nothing is plugged into it on my '99 S10. Have one on each side of the rear frame.

Reason I'm asking is because I broke that ground wire on the driver side removing the harness to clean and paint my frame.

Now trying to pinpoint why my new fuel pump won't turn on?
Would the broken ground relate to that?

The harness for the fuel pump is in tact and grounded.

Thanks for any help!
Old 03-11-2013, 11:32 PM   #10
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Re: 98 s10 rear chassis harness to taillight harness questions.....

ya i replaaced my fuel pump for $250 and then realized my wiring was wrong near the taill lights, fixed the harness near the tail light connector and the fuel pump works good.

i cut off the ground connector with the 5 ground wires and hooked them all right to the frame.
Old 04-18-2013, 10:21 AM   #11
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Quote: Originally Posted by Sleeper S10
Sorry to high jack this post.

I have a question on the green harness section in the above pic with 4 wires and another ground off to the side?
What's that for?

Nothing is plugged into it on my '99 S10. Have one on each side of the rear frame.

Reason I'm asking is because I broke that ground wire on the driver side removing the harness to clean and paint my frame.

Now trying to pinpoint why my new fuel pump won't turn on?
Would the broken ground relate to that?

The harness for the fuel pump is in tact and grounded.

Thanks for any help!
Those 2 connectors your talking about, they are common grounds, need to have them grounded for sure
Old 04-20-2013, 11:41 PM   #12
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Re: 98 s10 rear chassis harness to taillight harness questions.....

Driver side frame connection (from frame out to the bolt): One STAR washer. Then one lug w/ black wire going toward front of truck is pump main ground. Then Another Star Washer. Then A small Black wire that leads into the green grounding block (the rear lights main ground). Another Star Washer. Then the 13mm bolt.

Passenger side Frame rear: (from frame out to the bolt) One star washer. One lug with small black wire that goes into the green passenger side grouding block. Another star washer. Then the 13mm bolt.

I just got through replacing the pump in my truck tonight(1hr 38mins ago) so I kind of got it all memorized at the moment....lol.

Hope this helps.

P.S. It would be good advise to relocate the fuel pump ground closer to the pump. What I did was cut the lug off, attached a gold plated lug. Then got some new star washers and drilled a new hole for the new bolt and locknut to hold it all together.
Then I coated the connection(bolt and all around it) with a weatherproof sealer that won't flake or rub off.(similar to winshield urethane) It should last forever I think...
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