PDM 30 Inputs & GM steering column turn signal switch

[NLSX454]

Hi all,

Looking for help on wiring up my 1970 GM Turn Signal Connector to switched inputs on the PDM30. Attached is the IDIDIT factory wiring guide. The Purple wire normally provides +12V to the steering column switch and power is then distributed to whichever function is activated (left turn, right turn, etc.).

My question is, can I reverse this? Here is my plan. Using the right turn signal as an example. Since there are two output wires for the right turn signal (Royal Blue - Right Front) and (Green - Right Rear) from the column switch, I would use only one of these as an INPUT wire to the PDM. For the PDM Sensor 0V ground I would use the Purple wire (formerly the 12V wire) which would complete the switched circuit in the PDM.

On the Output side, I have separate 8A channels to drive the right front and right rear lamps. Separate because the brake light switch when active will trigger the left & right tail lights.

Thank you in advance!

Neil

[David Ferguson]

I think you have described it correctly, I would test using a ohmmeter to make sure the switches connect as you describe.

[NLSX454]

Thanks David.

I wired the rear turn signal inputs as mentioned and also wired in a brake pedal switch to a dedicated input and sens 0V input and had a good result. Both turn indicators work as well as the brake lights.

Thank you.

Neil