The guy I bought the xjs from said there was a short in the wiper motor and it would always run the battery down. That's half the reason he was going to sell it cuz wiper motors for these cars are.... well not cheap. He pulled the v12 which was in nice condition and was going to junk the body, but never could fix the electrical gremlin.
So one day after I forgot about the whole wiper deal I was driving in the rain. Parked it in a lot and left and when I got back the battery was dead as a good indian. I traded in the recent battery and got back on the road... the wipers always stayed in the 1/4 up position on the windshield after I used the motor.. turns out after some playing with it I found out you have to push the blades all the way down after you use the wipers and it turns off power to the motor. Otherwise you've got a full circuit running at all times
I had a few other headaches with gauges, but the electrical seems to be ok now...knock on wood
So one day after I forgot about the whole wiper deal I was driving in the rain. Parked it in a lot and left and when I got back the battery was dead as a good indian. I traded in the recent battery and got back on the road... the wipers always stayed in the 1/4 up position on the windshield after I used the motor.. turns out after some playing with it I found out you have to push the blades all the way down after you use the wipers and it turns off power to the motor. Otherwise you've got a full circuit running at all times
I had a few other headaches with gauges, but the electrical seems to be ok now...knock on wood