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Check the repair walk throughs at AllPar.COM for the Infinity units.

RwP
How incredibly unhelpful. :jerkit: Seriously dude, take your meds.


It's one of three things:

A) The antenna plug has come loose out of the back of the head unit

B) The antenna itself is loose in the fender hole and/or the mount has rusted

C) There is a break/short in the cable between the antenna and the head unit.

The AM tuner will pick up a signal even if the fender antenna is disconnected simply due to the properties of AM radio. But the FM tuner won't unless you're right on top of the transmitter.
 
I have the same issue and have replaced the entire antenna as well as the cable. Still terrible fm reception. I even replaced all the grounds on the entire truck and ran a new one for the radio.
 
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