Re: 1940 Turn Signal Wiring Diagram

Posted by DavidPackard On 2021/10/3 17:36:31

Gar;
Because the pilot lamp is mounted inside the flasher housing, you should have 7 wires there.
They are:
1. Stop light power input
2. Flasher power input In the photo looks like either the Red or Black wires
3. Flasher pilot lamp input In the photo looks like either the Red or Black wires
4. Right front lamp output
5. Left front lamp output
6. Right rear lamp output
7. Left rear lamp output

The remaining brown wire in the 3 prong flasher socket should be perhaps hot always, or hot with ignition key on. Assuming you find power at the brown prong I would jumper power to the black prong. Stick a fuse in the jumper just in-case. If the indicating lamps turn ON then the black wire is the pilot lamp input, however if the lamps do not come on then place the turn signal switch into a ‘turning’ position and retry jumping brown to black. Assuming the lamps are good then one of the lamps should light, and you just confirmed the black wire is the pilot input. If this fails then you will have to repeat the process with the red wire, but I’m expecting the black to be the pilot and the red the load side of the flasher, that is, the flasher power input into the flasher switch.

The next step is to find the brake light circuit. One of the wires should be hot only when the brakes are applied. You can trace the circuit from the brake light switch to the turn signal switch. Since wire 1 & 6, and 1 & 7 are common finding the brake light input power wire is best done by tracing the wire itself.

The only wires left are going to the 4 corners of the car. One at a time we want to apply power and confirm which light is ON.

Did I mention you’re writing all of this down, because once you’ve identified all 7 wires that’s your homemade wiring diagram.

See thread ‘1956 Clipper Turn Signal’ posting #6. The attached diagram is for the Packard turn signal switch (it should be electrically identical to yours), but because the pilot lamps are dash mounted the Packard switch is a 6 wire design.

dp