I have a 2008 Subaru Impreza standard with 139,000 miles on it. I just recently replaced the AC Compressor and the next day the car would not start and was completely dead, no dash lights or anything. My first thought was to jumpstart it, which worked and I let it run for about 10-15 minutes, and then it died. I attempted to start it again and nothing happened, still no dash lights. I also attempted to jumpstart it again and nothing happened. I figured it might be a battery problem so I bought a new battery and put it in. When I turned the key, all the dash lights came on but the engine would not start, not even crank or click. Also, the old AC Compressor did not have a belt on, so I'm wondering if now that it has a belt if it could be messing up something else. Just a thought. Hope somebody can help me, thanks.

 

Update: I forgot to mention that something is draining power from the battery. Because I have charged my battery multiple times after it continues to die. I figured it might be because of the AC Compressor but I unplugged my AC Compressor and the next day my car was dead. So I charged my battery and put it in and the dash lights came on again and then today only some of the dash lights were on and the remote unlock didn't work.

Edited July 22, 20178 yr by JRounds1231

Check that you didn't accidentally disconnect the small wire to the rear of the starter?

 

Sounds like you disconnected it maybe moving the low side A/C line around?

I would check all your power and ground connections.  You were working around the battery and fuse boxes, very likely a wire came loose or disconnected itself. Adding a belt has nothing to do with this.  BTW great place putney , I used to live there for a time back in the 70,s .