someotherguy
Truly Awesome
The covers aren't glued to the board. Something weird going on there. I wonder if that's a reman wiper motor and the builder put some kind of goop in there?Well, took cover off wiper motor. Thought it was going to break. Didn't realize the board was glued to the cover. Looks like new. The PCB looks pristine. No cracked solder points or discolouration at all. Even carefully pried up a corner of the board to peek at back and it looks new as well. The one contact point was wore more than the other but there was still tension on both. Cleaned the ground as well. We'll see if it stops or fails to park.
On another note while driving home late last night with high beams on they quit after 30 minutes. Sat for 10 minutes with switch off and they worked again but only for about 10 minutes. Waited again and they came on so drove the rest on low beam. Years ago I replaced high beam with 65 watt bright whites and it occurred to me it's been years since I had driven any distance on high beams. Checked that ground but it was less than 3 ohms. Cleaned it anyway. We'll see.
At any rate, you can have cracked solder joints so small you need a magnifying glass to see them. You can trust me on that, I have ridiculous amounts of soldering experience in particular fixing bad joints on old equipment (I fix up classic pinball machines as a hobby.) BUT - the other ground issues you've found are likely contributors.
Richard