Has any one had this problem before.I have a 73 240z with wipe motor problems that are affecting the lights. I will try to explain the problem, when the the wipers are pluged in to the wiring harness and the light switch is in the off positon and if i turn the key on to the acc position the lights will turn on, if i disconnect the wipers from the harness it turns back to the normal operating procedure, also with the wiper motor pluged in and if i turn the lights on the radio antenna will go up. Thanks for have a read of this post