A:AnswerWe do not have anything specifically listed for a Topkick, but give us a call in Tech Support M-F 9am - 8pm EST, at 727-592-5991. We may be able to help you figure out a solution with a little more information about your truck.
A:AnswerThis harness is for installing an amplifier, we do not make this harness for the older Silverado. If you are looking for a radio replacement harness it would be the RP5-GM31.