Accessories

I’m hoping someone can come up with a solution to this problem. I recently had a problem with my Motorola Hard Install Car Kit Cradle. Whenever I attach my i860 to the cradle I hear a pulsing sound coming from the speaker for the car kit. When I disconnect it there’s no problem. I tried using different i860s and still have the same problem. I checked the fuses to see if it’s a power problem and they are ok. The reception is fine coming from the antenna. I also checked the pins on the cradle and contacts on the phone cleaning it with an alcohol swab. I’m thinking it has something to do with the cradle. Any ideas or suggestions would be grateful.