Please can someone tell me - even roughly - the maximum amps my alternator puts out? The vehicle is an '89 FJ 75, with a 3F motor - 3955cc straight 6, completely standard; the alternator is a Nippon Denso. Neither my workshop manual, nor the plate on the alternator give this info.
Also, a local auto electrician suggests re-wiring the alternator with thicker wire, to give a higher amps output - would this be a good idea?
Any thoughts would be appreciated
Thanks!
Alan
South Africa

This would depend on what type of options your cruiser came with from the factory such as power windows, door locks, rear heater, aux lighting, ac, etc... But I would guess around 90-115 amps.

The only way you can make the alt put out more amperage (as far as I know) is to have it re-wound, heavier wiring coming out of the alt, should'nt make any differance as far as out-put.

he probably meant re-wound, and wire it with thicker wire. I'd run some 4 gauge from the alternator stud straight to the battery... it worked on my junk!

I'm still learning this game - I did mean re-wound!
Please explain how running a wire from the alternator straight to the battery would help? From which stud do you mean? And to which terminal of the battery?
Thanks for the advice
Alan

If you really need more power, why not just get a bigger alternator like a GM CS130A? Besides being cheaper, it may also be more reliable than rewinding. Rewinding will cause problems with low speed output (less turns = lower output at a constant shaft speed), may cause problems with overheating of the stator and you would have to be sure that the diodes are up to the output.

Since my junk is older than I am, the wiring is a: small, and b: built up resistance over time. By the time the charging power went from the alternator, through the factory witing, and back to the battery, it had lost much of its "oomph".

I ran a 8-gauge (63 amp alt) wire from the charging post (usually the one with the biggest wire on it) straight to the battery, and saw higher voltage, and could run more lights before the voltage dropped.

Thanks for all the advice guys - much appreciated.
Alan