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My harness was made for the 138CD. The only difference from the 120 is the added length for the brake and tail light wires. Everything else is the same. The cigar lighters, dome lights, speedometer light, instrument light, map light, clock, clock light, heater, and defroster were all wired with point-to-point wire and not part of the main harness.

I have somewhat isolated the tail light dimming problem. The issue is clearly internal to the main light switch.

The way I tested is this:

1. Verified that I could again repeat the issue as before. I did observe that the tail lights dimmed more in the “instrument light” position than it did with the “map light” position. But, very repeatable…check.
2. I connected a jumper around the main light switch to the tail light and dash light circuit. With this, the tail lights were bright and did not dim with the map/instrument lights. This confirmed that the issue was not a ground problem and clearly indicated that the issue was with the main light switch. It also makes sense that the “map light” position did not cause as much dimming since there was only one bulb instead of three (gauges, clock, speedomter).

Now…my headlights, parking lights, dome lights, tail lights, and brake lights are all LEDs. However, the clock light, gauge light, speedometer light and map light were still the incancdescents. That made me curious given the previous issue I had with everything being incandescent and the thermostatic relay cutting in and out.

So, I replaced the remaining incandescent bulbs with LEDs….guess what….the tail lights never dim.

Now, in replacing the bulbs, you have to pull out the sockets which is the ground connection. So I was inherently touching the ground in this process. Due to that, I then reinstalled the incandescent bulbs and verified that the tail light dimming did, in fact, resurface. I then reinstalled the LEDs and the problem again disappeared.

During this process, I also noticed another issue that would also indicate a problem with the main light switch. In the Parking Light position, all is good. In the Country/Passing position, all is good. However, in the City position, all lights, headlights, tail lights, dash lights, have a slow flicker.

Anyway, clearly the issue is with the main light switch….it could be dirty contacts, but I know there is an issue with the thermostatic relay as well. Given everything I’m doing, I will get the main light switch taken care of.

On another note to revisit a topic of old…..As you may recall, I had a persistent issue with my old Stromberg EE14 carburetor with fueling bubbling out around a shaft after the car was shut off. Now, that I replaced that carburetor with the Carter WD-0 (which has been a dramatic improvement), I was able to do some looking at the Stromberg. One thing that I noticed very clearly is that it needs to be rebushed. That shaft was quite loose and sloppy.

Next topic….I ordered the wire I will need to re-wire the items that are not part of the main wiring harness….cigar lighters, dome lights, clock, etc..

Next up…replace the missing rubber to my inner fenders so that they will be ready to go back on the car. I haven’t bothered putting them back on since I’ve been doing other work and they get in the way. Fortunately, I made a little bit of an index of BigKev’s blog a while back so I could quickly find topics that I new I’d get to eventually…..inner fender rubber is page 41 of BigKev’s blog according to my notes.

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Did you order a full harness for the car, and it didn't have all the circuits, or did you order a partial harness? I haven't ordered a harness recently, but I would have thought that it would have all the wire needed for the car. At the risk of going off-topic, are all wiring harnesses like that?