headunit aireal??

[ls1 tiga]

hey all i just recently installed a kenwood h/u into my ss,
just bought the looms/stereo conectors you can get from any car shop so i didnt have to cut wires and whatnot,
but my issues lays with the fact that the aireal will only go up rarely?
i have made sure all connections are in secure and correctly.

can anyone possibly shed some light on this is possible?
cheers

[itsagixa]

Could be an earthing issue with the new headunit,
the power for the aerial is sourced from the head unit so the negative is in reference to the headunit, if you havent earthed the metal shroud of the headunit its possible you may only be getting a percentage of available power eg; instead of 12+VDC you may only get 9VDC.
you should get some green earth wire and connect one end to the back edge of the headunit and the other end to a metal bolting point behind the dash....
if you have a multimeter you can check continuity from your bolting position to the frame of the car to ensure your earthing is correct