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Discussion in 'Troubleshooting & Diagnosis' started by flidoug, Dec 15, 2017.
How do I bench test the fan switch on a ‘70 camaro non A/C heater control unit?
A wiring diagram would help you do this. It appears that you have terminals on the switch that have orange, yellow, light blue, and brown wires. The brown should be the power feed. Knowing that, you should have continuity to one of the other three wires in each of the low, med, and high positions. Those three wires then go to the resistor which in turn feed the blower motor through a single shared wire.
Are you specifically testing the switch or the motor operation on the bench?
Use a small battery, wire and a flashlight bulb
I guess I need to to know which post is power and which posts are to the blower/resistor. Can’t tell by just looking at the back of the switch. Just want to make sure all is good before it gets installed.
Here are pics if it helps.
12 and 13 look like power in.
15-16-17 are the various speed settings. I would guess 12 or 13 to 15-16-17 should short.
I cannot see the back of your switch to give you a better answer.