hi i have put a new head unit into a s4 and the antenna didnt work. i then put the relay in with no probs. when i turn the unit on the antenna goes up and wants to keep going. i can hear the antenna motor running. the head unit also looks like its going on off on off on off.any help would be usefull.
thanx

 

sounds like it wants to short out something, make sure that you put alot of electrical tape to it, when you are pushing the radio back , it might be getting snagged or you put 1 to many cables on the relay

 

my atenna did that too but the perivous owner put the head unit in so i dont know how he wired it, all i did was unplug the power to the atenna cause the i dont listen to the radio anyways.

 

my antenna does something like that, but when I turn the radio on, the antenna doesn't move at all. Any ideas there?

 

You didn't use a relay to wire up the power antenna.

 

an antenna motor that keeps moving even thoughthe antenna is all the way up, is a busted antenna mast insert.

replace the mast

 

Generally you want to avoid using electrical tape on bare wires. many electrical tapes are poor quality and will rot out joints in the harsh enviroment of a car.

3M 33 and 77 are some of the very few electrical tapes made for automotive use. Home depot brand junky home use electrical tape should be avoided all together in cars

 

I didn't even wire the head unit, it came in the car when I bought it

 

the antenna mast is not broken cause i put in another fc and works fine. however 4 some reason the antena signal wire has power but i put accesory power to it.hope this makes sense.

 

You put the antenna in another FC and tested it???

The factory power antenna has a stop built into it. When the mast reaches full height, the motor turns an additional 3 times and them stops. This is how all Harada power antennas work (Harada was the manufacture of the power antenna for Mazda).

The only reason for the motor to not stop is if the internal stop does not see the end of the antenna.