It is important to have a diagram when messing with any wiring of a vehicle. A person can get a free wiring diagram from most car part stores, many times the technicians will make a free print out.
http://www.commandocaralarms.com/wiring/1989/Nissan/Pulsar
where to find electrical diagrams for starting system on mercedes 300sel 1989
You can find one of these diagrams online. An image search can help you out though it is really complicated and may need the assistance of a professional.
AnswerThe Haynes manual has wiring diagrams in it. The wiring diagrams given for the 1989 Chevrolet Celebrity 2.5L F.I. are incorrect. Also note that Auto Zone told me the 1989 didn't come with the 2.5.
The rims match an 89 Nissan Pathfinder for sure.
You have to go to a forum for the section in question and ask what you need unless you want to pay for them, wiring diagrams for almost any vehicle are not online for free
You can try a website called auto zone .com
page 4-21 in a haynes manual from autozone
it is 12 atdc for the 88, I assume they are the same
A 1989 Pontiac stereo wiring diagram can be obtained from most General Motors dealerships. The wiring diagram can also be found at most auto-parts stores.
You could try Autozone. they offer free repair guides for members which includes some wiring diagrams. You have to sign up, but it is free. I am a member there and checked for wiring diagrams for your car. There were 80 different ones, but not all for 1989 Celebrity's. Depending upon what you are looking for it may be no help at all. I tried several search engines that led me to sites that took me back to searches. It was quite a waste of time.
Go to an auto parts store and purchase a Haynes Manual specific to your car.