I am currently going through the process of getting all my gauge cluster lights to work properly. The problem is I can only seem to get the left turn signal light on the dash to work, no other lights at all. I replaced all the bulbs and twist connectors with new ones but I have found that the connector that connects to the bottom of the headlight switch has melted but I repaired that with a new connector inside of it. Anyways I found a navy blue wite with a blade connector behind my dash, I will link a photo, but I have no idea where it goes to. I will link photos of most of the wiring if anyone can help. Thank you -Evan

It says my file size is to big even after compressing to upload photos.

The search button is your friend:

https://www.slantsix.org/forum/viewtopic.php?t=8463


Sounds like you need to spend some time tracing wires and making sure things should should have power do and things that shouldn't have power don't.

A meter or car test wiring probe with continuity sound helps a lot. Usually the test probes have one long wire.
A second added wire for probe end insures you can check wiring from inside cab to far ends of car. An audio signal keeps you from always having to look at meter.
For tricky problems or or partially open wiring, instead of low ohms anything somewhat higher or 3 to 6 times than normal short a meter will show. A partial open may still activate audio check, meter will show a higher value 8 to 30 ohms.

Keep track of all wiring that show good positive contact. Discolored wiring or seems weakened when moved around may be a clue.
Some test probes throw 12v to test electric components. Start at the bulb or wiring with test voltage if possible and work back. Is there a common power point for these lights, dash pcb? Anything charred or crispy looking?
A telescoping mirror and a good rechargeable flashlight helps to do inspection.
Wiring behind pcb? Sometimes these back wires with no wrap may rub against grabber mounting screws with course thread. Wiring diagram helps when checking overall with different areas.

Some headlight switches may have breakers in them .Check the switch if can. Sometimes these are cheap at surplus prices online.
You might be looking for just a small break in wiring.
I had to look under dash with legs thrown over seat as metal dash not helping on servicing. Me deciding to make flasher more accessible paid off when replacement needed and also when power wire to it went bad.

i have some parts car harnesses for 64 65 cars, just pay shipping and you can have them.

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Hyper_pak