I've been working on the car for a year now on and off and I finally got it running. Very rough..... Very ...
but the battery wasn't good enough to drive it to it's final destination where I could finish it and make it stable, long story short I put a different battery in the car which resulted in the battery being backwards and yeah .... Smoke came from the alternator and the fuses under the hood along with an array of problems to follow, which include but are not limited to! No power to instrument cluster at all, no power windows, no AC/fan. Plus the car won't start anymore. I checked relays and fuses. Replaced the bad fuses, a few blew. I'm pretty sure the fuel pump relay is bad. I tested it and it started humming also a j relay is bad so I gotta replace that, but I check to see if the correct wattage is coming from the connector and where the J relay blew the housing isn't getting any power, so I need to figure that out also.The other relays seem to be okay. Also not getting any spark, plus if anyone could help me find the exact type of bolt used on the camshaft sensor that would be amazing. I don't know if I should be posting this here but I don't want to be the person that starts a thread not knowing where to start it. So I'll just comment here and hope someone can help.. Thanks.

 

Do you have a wiring diagram? Here's the factory one courtesy of Brickspeed.

http://brickspeed.net/VolvoDocs/850-...ction_3_39.pdf

 

Thank you I'll look around and see what I can find. I truly don't really know too much about the car and honestly wanna fix it up for my girl. She loves the car.