wired up stereo. works fine until key is turned to ign on. i,ve wired yellow to live.red to neg. there is a black wire but i,ve taped it off.

Hi everyone,new to the site.given time and help i,ll understand how to navigate this site. Meantime the title says it all. Took my new baby, 1989 defender 90 down the M,way for first time. 10 miles in and my wifes backside was getting the heated seat treatment. Not having them i discovered an...