Perhaps the wiring harness has been replaced. Do not rely on wire color! Trace each wire end to end with a ohm meter and label each end with the same number. Confirm that you have continuity from end to end of each wire. Make sure you keep going back to the basics as you work through each circuit. It is best to do them in the sequence I listed them. Here are some suggestions to keep you going. And it can be tricky trying to troubleshoot them through a forum such as this. I know how frustrating it can be to track down wiring problems. I The dash lights will light up at the same time when I touch the black wire to one of the dash lights. I have managed to have them light up at the same time when applying the handle for left turn. There are dash lights in the instruments that are supposed to come on when applying the switch. I also have an excerpt from a chevrolet passenger car wiring diagrams for complete chassis ,(reprint) I have copied the diagram on my printer and enlarged it for my eyesight, and traced the lines to their respective point.Also, someone downloaded a copy of the 53 diagram in this discussion. The wiring diagram I'm using is out of the service manual for 54. the tail lights work great, if you switch the wires the unit is brighter (brake light circuit), and the front parking lights work great, I have LED bulbs in them also. I guess you could say the brake lights and tail lights are built into the same unit, as it is a LED one piece unit, purchased from The Filling Station. The turn signals are built into the column My vehicle is a car, 1954 Bel Air Convertible After I shovel snow and get a fire started in the shop. on the off chance that the flasher is bad, I purchased another one yesterday and will try it this morning. I know this is a long explanation but maybe you can see something that I can't. I would take pictures, but fts a little difficult to take under the dash. I know the orange wire from the headlight switch goes to the brake switch,from that a white wire goes to the column. I bought a LED flasher, but that didn't help. Which I did, nothing no lights or flashing. somewhere along the line the wires for the flasher unit disappeared, all except the yellow wire going to the column, the pink wire that went to the ign side of the gas gauge,(according to the diagram) was dangleing, so I opted to fuse it and attach to a power source, then I came to the black wire which according to the diagram was linked to the wires going to the indicators, I assume the dash directional lights. The confusion comes from my replacement of all the instruments, upgrading to 12 volts. This is a stock wiring for 54, I think 53 is about the same. Thanks for the response, you are right there is some confusion in the circuitry, first let me say, I am using the wiring diagram that is in the chevy manual for 1954, not much there but it shows the wiring and color codes.
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