SmallblockRX

ive got the complete interior out of an 89 GTU and im putting it into my 88 base model. ive figured it all out but what needs to be done to install the power windows? mine was equiped with manual windows. ive got the door harness out of the S5 along with the door panel and the window motor. how do i adapt all this to my 88 chassis?

Drivarotor

First off, if you've got the interior out of an 89 GTU (I have an 89 GTU) the power windows were installed by someone other than the factory. No S5 GTU came with power windows. Quite possibly it was a dealer added feature, requested by the original purchaser. Aside from that, everything will install in your car up until the harness location under the dash. The S4 harness (from the door) will not plug into the S5 harness (under the dash). From this point you will have to custom wire the harness from the door to the location of the power window fuse under the dash. Unless you get lucky and by chance everything plugs into where it is supposed to go, custom wiring is what you have to do under the dash. I did this conversion to my S5 GTU, minus all the S4 interior trim. I installed an Autozone (GM replacement) dual power window switch in the center console. I took up most of my coinholder space.