86 2.0 I4 NoStart No crank after removing wiring harness and reconnecting.

I’m good with my hands if I know what I’m doing. Thought I did but once I removed the harness to replace the belt tensioner and flushed the coolant, it wouldn’t even click on, no lights on dash and nothing lights up. My custom door popper ( which connects to the starter relay) gets power and pops the doors. So power is dropping off somewhere. Any electrical savvy ppl able to give ideas? I’ve gotten it could be grounds, ( all I can find are connected) it could be the starter relay itself ( OEM new otw) and it could be a old school “ fuse” line( smaller wire not ment to take more than X amps before burning out) the only ones I’ve found are connected for the poppers which clearly works. Help pls