North American Turbocoupe Organization



87 TurboCoupe Charging Issue
DiamondSCattleCo Offline
Junior Member
#1
Hey all,

Bought an 87 TurboCoupe a few weeks back. Car has a full load, including climate control and electronic ride control. Really enjoy driving the little beast, however the previous owner was obviously a hack and I have some real wiring issues. So I need to toss out a few questions:

1) Anyone know of a service manual online somewhere? I saw the link to the EVTM and thank you very much.

2) My most serious issue right now is a charging problem. About 3 weeks ago, I noticed the battery discharging whenever the headlights were on. Hooked up a voltmeter and got 13.3 volts with the car running and headlights off. Turned on the headlights and the voltage dropped immediately to 12.1 volts and kept on dropping. Revving to 3 grand brought voltage up to 12.5, but never above. So I pulled the alternator and found it had been overheated at one point in time or another and was pretty much wore out in other areas.

So I replaced the alternator and found I had about 13.7 volts at idle and turning on the headlights resulted in the same voltage drop. Revving the car brought it back to 13.7 this time though. So I turned off the lights, allowed the battery to charge, then turned off the car. I noticed the voltage kept dropping with the car off, until it dropped to around 8 volts or so, then held. I grabbed a battery from my truck and tossed it in there. Everything was fine after. 14.3 volts, headlights on resulted in slight voltage drop to 13.9, but slightly revving the engine brought everything back to 14.3. Turning the car off resulted in a reading of 12.7 which held.

Thought I had everything figured out.

Now today, with the lights off, everything is working fine. Alternators charging fine, cars starting fine. As soon as the headlights are turned on, I'm seeing a voltage leak. I haven't had a chance to pull the alternator and check to see if its burned out, but I doubt it. I'm beginning to suspect a grounding issue with the headlight circuit. Anyone have any other ideas? And where do I find grounding points on this car?

Thanks in advance. I have several other questions, but I'll save them until I have a chance to scour the forums and see if they've been answered elsewhere.

Rod
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Cerebral Offline
Senior Member
#2
http://search.ebscohost.com/
User Id: Greatfalls
Password: Publiclibrary

http://www.aa1car.com/carleyware/library.htm
1987 Automatic TC- parts car

1987 5 Speed TC, K&N on Vam,Boost controller, T3, Bob's Log, Stinger 3 inch exhaust with Magnaflow, FMIC, Forge Dual Piston B.O.V., Ranger Roller, Esslinger Adjustable Pulley, Boport Drop in Valve Springs, Pyro Pete Clutch
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