I just purchased a painless muscle car harness #20102. Is anyone using one of these? I'm putting this in a 71 Malibu 2dr. I have HEI ignition, Vintage air AC (car is a non air car), 4L60 with converter lock up, amplified stereo. I'm also installing a Powermaster 100amp int reg alternator at this time. Any input on what to watch out for or tips and tricks? I also plan to use the h4 type headlights and know what to do there with the relays.

i heard painless were hard to put it. im gonna go with with M&H for my harness. they have factory style wire harnesses, exactly like the originals. iv heard they just plug in. you dont have to cut or crimp any wires, just take out your old one and plug in the new one. check them out. im sure they have the correct harness for your car. another member told me he did one in about two hours, removed and replaced with the new one. ive heard of up to 40 hours to install a painless harness, cuz you have to cut and crimp and stuff, its something to think about....dont want electrical fires. good luck.

I installed a Painless harness (18 circuit?) in my 66 because I have electric fans, electric fuel pump, PW's, etc. It's not exactly painless, but you don't have a ton of choices when doing custom stuff. I hear the M&H stuff is real nice, but it does not meet your needs as it comes (and is quite expensive to do the whole car). With the M&H harness you would likely need to add an auxilliary fuse block (I think they are something like 4 circuits) in order to set up your aftermarket stuff.

Thanks for the input guys. I'm not in a hurry as my car is dissasembled. Since the interior is out I thought this was the best time to do this. My original harness is ok for now but can't handle all the upgrades. I know I have to upgrade it anyway so I'm aproaching this step.

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I just put one in my 69 elky. Like said it 's not painless but not hard. Since i have an el camino i had to lenghten some wires to the rear tailight only right side. Other than that and putting on some of your own ends it isn't hard i would do it now.

If you know anything about electrtricity and electronics you can add solenoids/relays and fuses to extra electrical loads to your car and not have any problem using the OEM or OEM style harness.

I have allready purchased the harness. The reason for the upgrade is that I allready rewired the engine for the HEI, tach, A/C, Elec choke. I removed all the wireing for the tsc. I have to wire the lockup converter and new alt. I have fuses and relays for the A/C, Stereo, alarm, plus I rewired the starting cuircut. The original 43 amp alt did Ok with all these changes and when something happened I had to search for the fuse which could be anywhere. I allready have a few extra holes in the firewall for the extra wireing that I want to run through the fusebox. It's pretty clean but I want it cleaner.

As for adding cuircuts you need to start at the main buss. Otherwise you can increase the load on a cuircut and starve the power to whatever is on that cuircut. Adding to many extra cuircuts increases the load on the alt. When upgrading the alt output you also need to increase the size of the supply wires to the main buss. I'm at a point where I want to upgrade the number of cuircuts and the power supply. That's why I chose this harness. I plan to keep or buy a new rear lamp harness but the rest will be redone.

I would love to know how this went since I am looking at rewiring the entire electical system in my 65