Wiring harness

[suobs]

1994 4x4 hardbody King Cab.

I've been told by the dealership that my taillight wiring harness is no longer available and would have to be custom built by a mechanic at a cost of $400-$600. I've posted on this before and really don't wnat to spend the money on something that I haven't yet convinced myself I can't fix.

The problem is that the left brake light isn't working (it's one of those 1157's. It lights when the lights are on but doesn't get brighter when I step on the brake). Before I get a ticket I'm looking for DIY options of course. I'll assume the mechanic thoroughly tested things because he always been reliable.

Questions:
What exactly is a wiring harness? As near as I can tell it seems simple enough - a bunch of wires ending in sockets? Am I missing something here? Are there relays or something? WHat's to "rebuild"?

If it's simple, it would have to be either a broken wire or a socket that's gone wrong or something like that? Not that simple?

Is it possible the light socket is at fault? If so, is it called a light socket or something else? Bbecause they're not turning up in searches.

Anything else I can check? U-Haul installed a trailer light thing years ago and I'm wondering if I should remove it and resplice the wires. Or would the mechanic have checked that already?

[carloslebaron]

This is a wiring hardness

http://images.search.yahoo.com/search/i ... ng+harness

I had a problem with a front turn signal light, somehow water got into it and the light socket went bad. At that moment, no one had the part available in the stores, and I replaced it with a similar one I bought from the store's shelf and adapt it to the light. ,

In your case, I think the dealer found that the problem is with a wiring hardness that is a combination of wires, and if lucky they must be identified by the same color for each purpose, warning light, break light, etc... If the colors of the wires can't be differentiated, the work will be a little harder, but you might need to use a tester anyway for any procedure you do with electric connections.

I guess that if no online auto parts sells the wiring hardness for your truck, you might try the junk or the online used auto parts, or eBay. To me, the last resource should be to do the connections "straight" without the end connectors, but if no other choice is available...

[suobs]

Not sure what you mean in the last paragraph about "straight" connections without end connections.

[suobs]

This is a wiring hardness

http://images.search.yahoo.com/search/i ... ng+harness

So I'm right it's just a bunch of wires with connectors. It's hard to believe the whole thing can be "bad". It must be somehing like an individual wire or socket, right? Which I can test if I can follow them, right?

I guess what I'm getting at is, does the "harness" include everything all the way front to the battery/brake switch, or is it something that connects at the end of the body wiring somewhere around the gas tank/spare tire mount. From the photos you sent (which seem to be stereo harnesses) they seem short so I assume it's a discrete group of connections near the rear of the vehicle.

[carloslebaron]

My mistake. I should say "direct" connection, this is to say, wire to wire and remove the connector.

Look, this is the hardness wiring for my truck, that is 2WD 4 Cylinder, but perhaps yours have a similar setting of cables.





I think that with these diagrams you might have at least an idea where to work in your truck. Please remember that the wiring of your vehicle may be different because is from another year.

You are correct, the problem probably is at the terminal of the hardness, and my suggestion is to start with the light bulb first -replace it with a new one-, second the light socket, third the connector to the light block, and so forth.

If I'm doing the job I should start this way because it is the easiest way to start, and if you are lucky the problem might be right there.

Otherwise, you should remove the seat to reach the other hardness, check with a tester the brake wire -positive to the brake wire, negative to the body of the truck or any bolt without paint- if both connectors -the one at the rear light block and the one under the seat are fine, then the problem might be in the wire itself, so you might check the wiring line to see if it is broken somewhere.

If no problems with all the above, then check the connection to the brake...but such it the last step, because is the harder one.

I''l hope you find the problem and fix it without much trouble.

[suobs]

I'm on it today. Where did you get those diagrams? Yours is a '95? I haven't seen anything like them for my '94, and I have both Chiltons and Haynes manuals, plus a Nissan repair manual. I'd love to find something like that, or the parts numbers that go with those numbers on your diagrams.

[carloslebaron]

I just remember that the service manual for year 1995 is the same for year 1994.

If you hurry, you can buy it at a bargain price on eBay.

http://www.ebay.com/itm/1994-Nissan-Tru ... 51&vxp=mtr

[Rev_D21]

Check www.car-part.com or your local junk yard. Any Nissan D21 truck from 1986.5-1997 will work.

[suobs]

I just remember that the service manual for year 1995 is the same for year 1994.

If you hurry, you can buy it at a bargain price on eBay.

Thanks that's great info. Picked it up for $18.

[suobs]

Check http://www.car-part.com or your local junk yard. Any Nissan D21 truck from 1986.5-1997 will work.

I remember junkyards from when I was a kid, but I can't seem to find any now! What do they call them these days?

That website is great. Plenty of engine, transmission, front, and a few other harnesses but no taillight harnesses in that date range.

[Rev_D21]

I just remember that the service manual for year 1995 is the same for year 1994.

Actually Nissan released another '1995 Supplement' which states "Please use this manual in conjunction with the 1994 Nissan Truck and Pathfinder model D21 Service manual (Pub no. SM4E-0D21U0) which inclused all necessary service procedures, service data and specifications. DO NOT USE ANY WIRING DIAGRAMS OR HARNESS LAYOUTS INCLUDED IN THE 1994 NISSAN TRUCK & PATHFINDER, MODEL D21 SERIES SERVICE MANUAL (Pub. No. SM4E-0D21U0)." so the above statement is not 100% correct. This is in regards to the 1995 Model and is quoted from the 1995 Service Manual Supplement Pub. No SM5E-D21SU0 July 1994 Printing date which has a black cover.

http://www.ebay.com/itm/1994-1995-Nissa ... be&vxp=mtr

[carloslebaron]

I just remember that the service manual for year 1995 is the same for year 1994.

Actually Nissan released another '1995 Supplement' which states "Please use this manual in conjunction with the 1994 Nissan Truck and Pathfinder model D21 Service manual (Pub no. SM4E-0D21U0) which inclused all necessary service procedures, service data and specifications. DO NOT USE ANY WIRING DIAGRAMS OR HARNESS LAYOUTS INCLUDED IN THE 1994 NISSAN TRUCK & PATHFINDER, MODEL D21 SERIES SERVICE MANUAL (Pub. No. SM4E-0D21U0)." so the above statement is not 100% correct. This is in regards to the 1995 Model and is quoted from the 1995 Service Manual Supplement Pub. No SM5E-D21SU0 July 1994 Printing date which has a black cover.

http://www.ebay.com/itm/1994-1995-Nissa ... be&vxp=mtr

Rev_D21,

suobs owns a 1994 pickup truck...but thanks, I will buy the supplement...

[Rev_D21]

This is in regards to the 1995 Model and is quoted from the 1995 Service Manual Supplement Pub. No SM5E-D21SU0 July 1994 Printing date which has a black cover.

Just clearing up your '95 is the same as 94' statement.

[flipl18custom]

hi guys

I have an old 1992 nissan custom pickup with a L18 engine and desperatly need a wiring diagram for it ,it have the square dash ,i bought it secondhand and the whole wiring harnas have been cut off as it come into the engine bay on boath sides ,most of the wiring i sorted but i need to know there are 5 red wires with a black stripe and are not sure wich one goes where ,is there anyone who can assist me with help or a wiring diagram for the whole pickup or the lighting curcuit,wiper motor curciut ,

i will realy apreciate it

[flipl18custom]

hi guys

I have an old 1992 nissan custom pickup with a L18 engine and desperatly need a wiring diagram for it ,it have the square dash ,i bought it secondhand and the whole wiring harnas have been cut off as it come into the engine bay on boath sides ,most of the wiring i sorted but i need to know there are 5 red wires with a black stripe and are not sure wich one goes where ,is there anyone who can assist me with help or a wiring diagram for the whole pickup or the lighting curcuit,wiper motor curciut ,

i will realy apreciate it