1965 1966 Mustang Turn Signal Switch Wiring

I’ve I have been doing rather a lot of work on my car the past 6 weeks and I’ve a wiring haywire somewhere. First off, the car starts fine, runs fine, lights work, brights work, tail lights work, reverse lights work, parking lamps work, horn works. I have added the following new parts.

New tail light kit (housing, bulbs, chrome, etc.)
New backup lamp kit
New parking lamp kit
New main wiring harness from Mr. Mustang; the primary headlight switch wiring harness (voltage reg, lights, park lights, horns, alternator, solenoid)
New main wiring harness for the engine (temp sending unit, oil sending unit, two speed fan, ignition, coil, etc.)
New Autolite Voltage Regulator
Rebuilt the fuse box with shiny new connectors and fuses.
New alternator wiring harness to match original that plugs in to the headlight wiring harness and attaches to the positive side of solenoid
New starter
New Scott Drake constant voltage regulator on the back of the inst panel.
New flexplate (flywheel)
New neutral safety switch

Battery has been fully charged on the local Autozone
Alternator passes the test (twice) done at Autozone

So here is/are the problem(s)

1. The ALT lamp stays on constantly. There is no sign of battery drain as I can drive around town, stop, start again, leave it for 4 days and go out and start it again.

2. When i switch the key to the “On” position, the left turn signal works fine. When i put the appropriate turn signal on, both rear taillights flash as if it were using hazard lights (which I haven’t got).

Wireless Touch Switch White 2 Gang 1 Way Touch Switch For Lamp3. After i switch the key within the “On” position and activate the parking lamps, the left turn signal works fine. When i turn on the right turn signal. The turn signal light comes on and stays lit. The precise tail light and park lamp come on as if it wants to flash, however it stays bright. At the identical time, the left tail lamp dims only a bit but still stays lit because it is within the parking lamp position.

4 When i switch the key within the “On” position and activate the lights, the same thing happens as explained in #3

***Here is where it starts getting weird***

5. If I leave the important thing within the off position and not even have it within the ignition, nothing happens left or right, obviously

6. If I leave the important thing in the off position and not even have it in the ignition, and turn the parking lamps on and then the left turn signal, nothing happens except the left tail light dims a bit. But when I activate the fitting turn signal, the left rear tail light dims a bit after which the oil light comes on (yeah.. head scratcher). And to make that more weird, if the fan is within the low or high position, it would make the oil light blink and the heater fan start pulsating in the identical rhythm because the turn signal noise.

7. The same thing happens because it did in #6 if I leave it in the off position, not have the important thing in it, turn the lights all the way in which on. The left tail lamp will dim a bit and the oil lamp will come on. And if the heater is on, it would make the oil light and heater fan blink/activate in unison with the turn signal flasher.

Obviously there’s a wiring mix up here, but I can’t seem to seek out it. I am decently skilled in the case of working on this car because it’s so mechanical and the wiring is pretty basic, but this has stumped me. Does anyone have any ideas of where to start with this? I have a feeling that when the culprit is found, the ALT light will go off, the oil light will stop flashing and all might be back to normal. That’s the way it seems to go together with this car.

Again, starts fine, drives fine, but this issue is weird and confusing. All of the fuses within the newly rebuilt fuse block are still good, but maybe I shouldn’t rule out a mis-wire on the fuse block. But when that were the case, I would think there can be much bigger and noticeable issues.

I haven’t replaced the turn signal 2 prong plug because I have never had a difficulty before this. So that’s not new.


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