i changed my complete under dash harness to a crx si in my stock std. plugs...everything was plug and play...but now my tails + brake lites arent turning on..i checkd fuses....just a lil frustrating...any ideas...

 

so you put a crx si harness into and STD HB? the harnesses from a crx and civic are different. i would swap the complete harness over. that might be why your lights are not working. the tails are different between the HB and crx.

 

SO DO U KNOW IF THE 88-89 AND 90-91 HARNESS DIFF?

 

I know that on the hatch's, there are differences in the rear plugs that connect to the rear looms between the 89-90 years. The wiring is nearly identical. Not sure about the crx'shough. good luck.

 

i hope your engine harness is an si harness as well otherwise you're engine isn't going to run anymore.