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· Premium Member
4,414 Posts
Discussion Starter · #1 ·

I'm about ready to install my new inner fender on the passenger side, but before I do...

The car came with an AM radio so there is a capacitor on the ignition coil and the voltage regulator for noise supression. BUT, I want to put a factory AM/FM radio in the car. FM equipped vehicles got a capacitor installed in-line with the A/C blower motor.
Do I really need this blower motor capacitor, in other words will have issues with static noise on FM? If it is an issue, does anyone know the value of the capacitor--I'll install my own, how many microfarads (uF) is it??

I want to know before the inner fender goes back on as it makes it hard to get access to the motor power connections.

· Registered
2,231 Posts
You won't need it so much for FM as you would for AM. Amplitude Modulation picks up all the noise so you are installing an RF bypass (shunt) to ground. A .01 mFd cap with a Vb of 15-20 Volt (Voltage breakdown rating) is perfect for that. The high frequencies generated by motors and alternators will pass right though the small value caps to ground.

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