1988 Toyota Supra Alternator not charging, battery light st

LCP2000

MEMBER
1988 TOYOTA SUPRA
6 CYL
2WD
MANUAL
180,000 MILES

Hi, I have an 88 Supra NA which I have replaced the alternator on 2 times. 1 Alternator had tested good from Autozone, tested bad when returned. I have checked wiring, fuses and fusible link and no discernible problems. Originally when I got car someone had run a wire across a damaged fusible link (could it have damaged something else along the way?). I replaced it with a 100A link. When I start the car, the battery light stays on. If I run the car at 4000rpm or more and keep it there, light goes out. Is the fusible link the correct value? I cannot find any reference to the NA model, just the Turbo, which is 100A.

Any help is greatly appreciated.

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

If the wire fried the fusible link, there may be other damage to it. Use a Meter to measure the resistance (Ohms) of the main charge wire to the + battery terminal.

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Monday, January 18th, 2010 AT 12:13 PM

LCP2000

MEMBER
3 POSTS

I've traced all wiring inside the engine bay and everything seems ok at first glance. There are three wires that come out the plug in back of the alternator and one thick one that bolts on top. I'm assuming the thick one is the charge wire? Should I be measuring this while everything is connected to BAT and ALT or just wires alone?

Thanks.