View Full Version : After market wiring harness

08-18-2007, 09:56 PM
As some of you know I purchased an EZ-Wiring harness for my car.

I bought the 21-circuit setup and was glad I did.

Here are some things I learned.

1 – It is not easy and if you can’t read a wiring diagram you should not do this.

2 – You must save all of your old harness and connections. I used the original connections and attached them to the new harness wires. This helped keep the shrink tubing to a minimum. I used a dremel tool to slit the crimped connection, soldered the harness wire to the old connector and slipped it into the AMC plastic connector shield.

3 – You MUST, MUST have a wiring diagram for your year of car.

4 – As someone mentioned in another thread, your car came with an ammeter not a voltmeter.

5 – The after market outfits do not cater to AMC. AMC mixed and matched the Big 3 stuff so you must do a bit of detective work and throw in some logical thinking to get things working.

6 – Be innovative and don’t be afraid to deviate from the instructions. I used the Cruise Control circuit to run my defroster.

7 - The NSS is kicking my **** but as soon as I figure out how to wire it I will let you know.

8 – It was worth it but if I had to do it over I would probably buy a reproduction harness if I had the option.

08-19-2007, 09:43 AM
Nice post on your thoughts Javelin60.I'm sure it will help others.

05-27-2008, 12:45 AM
An update to my previous post.

I have not been able to get my chrging system to work. I traced the problem to the voltage regulator. I purchased a new regulator and installed it. It worked for 3 days and then fried.

Through a bit of research and some direction from another forum I believe the problem to be my elimination of the "Idiot Light". When I installed the new harness I eliminated the idiot light because the installation instructions did not address the light, I didn't know how to add it to the new harness and I didn't think it was needed. This thinking appears to be wrong. The Motarola charging system needs the "Idiot Light" to function properly.

I found this during my search. It will be helpful getting the light back into the loop.

AMC/JEEP Motarola Charging System 1965-75 (http://www.electricalrebuilders.org/techlib/techbasics/0604techbasicsmotorola.pdf)

I hope this can be of use to any of you that plan on rewiring your cars.

05-27-2008, 01:30 PM
Update part 2.

I contacted Painless about this problem and learned that by placing an 82ohm 5 watt resistor inline with the excitor should eliminate the problem.

05-31-2008, 04:23 PM
Update part 3

I obtained an 82 ohm 5 watt resistor and hard soldered it into the excitor wire. I fired her up and the charging system now works as it should. :)

07-28-2009, 03:41 PM
Final update:

I finally figured out how to wire the NSS relay properly. It took a while but I'm happy that I have a working NSS.