My review of the Painless Wiring Harness - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 11-08-2000, 10:32 AM
Posts: n/a
My review of the Painless Wiring Harness

I ordered the Pre-Terminated Wiring Harness (Part Number: 10110) for $389.95 from 4WD Hardware Inc. This is my review of the Painless Kit and the installation.

The bottom line: The harness is very complete. It even came with wire-ties (Zip-Ties), Light-bulbs, crimp connectors, extra fuses, ballast resistor, grommets, and other useful things that you will need. Other things that you should have on hand: Soldering iron, solder, shrink wrap, electrical tape, flux (the most important), a good wire stripper, a Jeep wiring schematic and any electrical items that may need replacing.

Before starting I did a check of my existing re-usable components. I ended up ordering: a new dash light kit, temp sending unit, oil sending unit, fuel sending unit, hi beam dimmer switch, starter solenoid and a headlight switch.

The Harness itself comes in three sections:
Rear Assembly (Tail lights and the fuel sending unit)
Dash Assembly (Gauges, Radio, Switches, Fuse Block, Dash Lights, Column)
Engine Assembly (Head Lights, Directional, horn, ignition, charging system, wipers/washer, backup lights, 4WD light, intake heater, oil sender unit, oil pressure sending unit, AC, and other wires that I have no idea what they go to.)

The Rear Assembly harness was the first piece that I installed because of it's simplicity. The kit came with the rear harness terminated with FEMALE weather tight connectors. All I needed to do was use the included MALE connectors and wire up the tail lights and plug them in. The fuel sending unit really only uses one wire (Pink). The rear assembly took about 2 hours.

The Dash Assembly Harness was great. All of the colors were based on the factory color code. It came with new bulb sockets already installed. The windshield wiper plugs were labeled but the factory switch wasn't labeled. I have heard people complaining about the instructions from Painless,however, the problem is with the switch not the harness. Painless even ran enough wires for the factory options (AC, block heater and the radio). I was able use some of these wires for my on-board air setup. At first, some gauges were not reading correctly, all due to ground problems. The dash assembly took about 5 hours.

The Engine Harness took the longest to install and caused a few head aches. There are really two main components to the engine harness, there is the light, directional, horn, wiper/washer harness and then there is the ignition/charging system harness. The headlight harness was awesome, it was the exact length, had the proper connectors and was entirely wrapped in Split loom tubing. The only problem that I had was that I forgot to run a good ground from the frame to the grill and this caused some interesting blinker problems that were very difficult to troubleshoot. I had to completely rewire the ignition twice. This is where having that multimeter is critical. Sometimes different color wires are spliced together in the split loom that maybe confusing. I ended up removing the split loom to make it easier. Wiring the ignition module itself is very easy because of the color coded wires. The only thing that I screwed up on the charging system was the black wire in the alternator harness. I figured that was a ground wire, but it isn't. I think that wire is for the Alternator failure light. The engine Harness took about 8 hours.

Keep in mind that this project requires alot of patience. Things ARE going to go wrong. No install is flawless. I had alot of ground problems because of my haste. Just because the kit is pre-terminated, doesn't mean that you will be finished in four hours, there will be some re-engineering on the fly.

During the project I burned out a soldering iron and had to run to Radio Shack for a new one and I used about 6 feet of shrink wrap. I love shrink wrap and hate electrical tape. Electrical Tape is a temporary fix and should only be used where needed. The same for crimp connectors, I just don't trust them.

I can't stress enough that patience is key. It's similar to building an engine, installing new gears or a new lift. If you rush and cut corners, you'll be fixing it again in two weeks. If you are not up for the challenge, don't half-ass it. It really sucks to spend $400 just to burn out the harness in a short time. IF done right, you shouldn't have to replace that harness again for a long time.

The total time for the project was about 20 hours. I did alot of the prep work [5 hours](removing the old harness, reading the instructions about 10 times) the weekend before.

Jay C.

I know what you're thinking. Did he fire six shots or only five?
Sponsored Links
post #2 of (permalink) Old 11-08-2000, 12:01 PM
Join Date: Sep 1999
Location: Atlantic City, NJ
Posts: 524
Thanks: 0
Thanked 0 Times in 0 Posts
Re: My review of the Painless Wiring Harness

Nice write-up. Just wondering if you or anyone else can help me with an electrical ground question. I know that a lot of things are grounded through the body. My question is about painting and rust protection for the body parts that connect with each other, ie. fenders, grill... I am currently starting a frame-off rebuild on my CJ-7 and will eventually get to cleaning and painting the body panels. My conncern is the surfaces that mate the grill to the fenders and the fenders to the tub. Should I paint these prior to assembly, leave them bare (metal to metal) or what? It seems to me this is where it will rust if not protected in some way. Any ideas? Thanks,

fratt77CJ7 is offline  
post #3 of (permalink) Old 11-08-2000, 12:46 PM
Posts: n/a
Re: My review of the Painless Wiring Harness

The bolts usually take care of the ground for you, but if you leave it bare use some sealer.You can get it wherever you buy vehichle paint& material.The stuff is called seam sealer, and it comes in a tube you put in a caulk gun.Put it between the panels before you bolt them together and on the seems afterwards.It'll be a pain if you have to remove the panels later, but It shouldnt be because of rust!!

Sponsored Links
post #4 of (permalink) Old 11-08-2000, 01:35 PM
Posts: n/a
Re: My review of the Painless Wiring Harness

I would paint them then bolt them all together. Then I would run a dedicate ground wire to each, fenders, grill front of body back of body, frame, engine, tranny and dash

4.2 w/<font color=blue>(4.0 head & MPI)</font color=blue>
Process of a moonguy after beer
[img]/wwwthreads_images/icons/mad.gif[/img] [img]/wwwthreads_images/icons/frown.gif[/img] [img]/wwwthreads_images/icons/crazy.gif[/img] [img]/wwwthreads_images/icons/wink.gif[/img] [img]/wwwthreads_images/icons/smile.gif[/img] [img]/wwwthreads_images/icons/blush.gif[/img]
post #5 of (permalink) Old 11-08-2000, 01:53 PM
Posts: n/a
Re: My review of the Painless Wiring Harness

Bottom line: I agree that the Painless kit was very good and thanks for the detailed writeup. With respect to the windshield wiper connection, as you noted you must use the factory harness and reconnect to the yellow and orange wires identified on the Painless kit as for the wiper. Perhaps I didn't read carefully enough as when I went to reattach the two, I found that certain wires (6) led elsewhere to a "black box" which I am told deals with the intermittent feature. Perhaps when I cut out the wiring for the computer I cut away this black box from the balance of the factory wiper "plug". In any event, the intention was to give a even bigger heads up to whoever uses the Painless kit.

With respect to their wiring diagram, it is useful. However there are some additional wires which a detailed wiring diagram if provided by Painless could clarify (ie someone knowledgeable could discern differences between the Painless wiring system and the factory system etc).

Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome