My '72 F-250 has a condenser below the v/r. Bullet connector between that and v/r harness plug was corroded and broken. I repaired it yesterday but wondering what it is for?
Going to 3g alternator later so just curious. I noticed no difference after reconnecting. Thanks all!

 

Radio noise. To help eliminate alternator whine through the radio.

 

Thanks JEFFFAFA. I shoulda known that. Just started working on these old trucks since my high school days in early '70s. Memory is second thing to go ya know.