Hey all, Im completely new to the Fbodies; always a Bronco owner. Picked up an 87 Trans Am today, but it appears ZERO accessories work; power locks, power windows, dome light, rear hatch motor, wipers, etc. Ive googled and googled, but cannot find the location of the 'accessory power relay'; which is what I am assuming is the issue. Also to note, there is an old aftermarket alarm system wired in, but it is not engaged. Any help would be great. If Im headed down the wrong rabbit hole, please point me in the right direction lol

 

First off, there is no accessory power relay on our cars, if you've lost power to that many circuits the #1 most likely cause will be one of the fusible links at the starter. Also, you really should get that old aftermarket alarm system out of there and put your car's wiring back to it's original as built configuration. Who knows, maybe the alarm is what (possibly) burnt your fusible link????

 

OK, I was using rockauto to search related parts, as I don't know of any good vendors with parts diagrams for these vehicles. They listed an accessory power relay, which is what made me think of that.
I will remove the alarm if needed, but until I get to know the car, I'm not comfortable doing that much wiring. I may try ordering a remote for the alarm and see if connecting to the alarm can 'enable' the accessories.
if anyone else has any helpful info, I'd love to find out

 

This will be a waste of money, no alarm is wired into things like your wipers and rear hatch motor.

Beyond any failed wiring that may or may not involve the alarm, you have a power distribution problem, with a blown fusible link still being the #1 suspect.

 

Getting a remote and having a functioning aftermarket alarm is a waste of money? OK guy

 

No, what your missing here is that aftermarket alarms are notorious for failing and doing a better job of keeping the owner from driving it VS saving it from a car thief.

I wish you luck with your future dealings with your car...........