Early heater fan wiring question, with bonus mystery wire Options

[r3dplanet]

My car has never had heat in the time that I've owned it. The car is a 1971 but the engine and wiring in the bay are all for 1973.

I took the time to completely refurb an early blower fan. It has two wires: one brown, one green. According to the wiring diagram I'm supposed to have wires directly from the harness to power it. I don't.

Where am I supposed to tap for power?

Also, on the relay board I have a mystery green wire coming from astern. I have no idea what it's for. Any guesses? See photos for clarity.

Thanks,
Marcus

[JeffBowlsby]

Hi Marcus...so you're the Schpankmeister huh? (IMG:style_emoticons/default/wink.gif)

The ignition harnesses are not all the same...to correct any misinformation. See my harness website for details. There are 3 Djet ignition harnesses and 1 Ljet ignition harness for our 914s. They are each different.

Issue: The 1970-72 cars main chassis harness does not have the wiring branch for the blower fan like the 1973-76 cars do. For the 1970-72 cars the fan connects to the ignition harness. For the 1973-76 cars the fan connects to a branch integral to the main chassis harness.

Easiest solution? Use a 1970-72 ignition harness to use the heater fan for an early 914. The only other way I can think of off the top of my head is to use the 73-76 ignition harness, then find the correct pin on the 12 pin connector for the (its either 10 or 11) for the green wire, then run a separate ground wire for the fan. You can study the two ignition harness diagrams and see what I am talking about. Or I can make a new or customize your existing harness to do the trick.