Had the same problem, only had a 3rd brake light working. theres a relay for the lights. I ended up accidently cutting mine bc i didnt know what it went to. and for the wipers theres the plug on the firewall that you keep i think it has 5 wires including a ground going in the firewall to a bulk connector. read my thread about it, i think its on the 2 or 3rd to the last page.
If you have both of those connected, its a ground problem. Ground the motor to the frame. Frame to body. Body to motor.



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