As the title states, I need to know the differences in the wiring pinouts between the 87 IROC and the 88 IROC, both TPI. There are some minor differences (fog lights, electric pump for the windshield washer fluid, ect.) but I want to make sure all of my bases are covered, and a Hayes and Chiltons are not very well defined between different years. The dash is the original out of the 87 but never came with the wiring harness. That is the dash I will be using (88 dash was cracked all over and hacked by the last person that owned it).

 

Also does anybody got the pinout for the different years for the harness connectors on the driver side firewall?

 

autozone.com has some diagrams in their repair section,
you can also try www.austinthirdgen.org in there tech articles section theres wiring diagrams, helped me with some wiring I was doing.

 

I will check it out, Thanks.