Exciting an OEM Alternator... Necessary? How?

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Spino

Spino

Joined
Jul 18, 2020
Threads
18
Messages
69
Location
Boulder, CO
Hi, I just installed a refurbished internally regulated OEM alternator on my 1984 FJ60. To my dismay, this rather expensive part isn't working. Battery charge is approx. 12v when motor is off and 11.5 when motor is running. Another curious symptom: When I unplug the alternator after killing the engine, my carburetor fan begins to run, as it normally did prior to replacing the alternator. (I have it wired to always run after shut-off, no temp switch.)

I did a bit of research that got me wondering if this alternator needs to be excited or re-excited initially before it will start to produce electricity. Does anyone know if that might be the case, and if so, how do I do this?

Thanks for your prompt help... This is my daily driver, and I'm a bit stranded if I can't get it working!
 
Was your previous alternator internally regulated?
 
Internally regulated Denso, assuming it's a factory style Denso should only needs ignition power, battery power, ground and if I recall correctly, an excite wire. You should share what you bought and how it is connected otherwise no one can actually tell you how to solve your problem.
 
Spino said:
I believe the alternator I replaced was internally regulated. There isn't an exterior unit in my engine bay. The part I replaced was not OEM. It was a three-prong that was made to fit the two-prong harness by a previous owner. Don't know much more than that.

This is what I got to replace it, and as I said, it isn't working (yet): https://shop.cruiserparts.net/index.php?main_page=product_info&cPath=4_3411_3440&products_id=68809
Click to expand...

Spencer:

As we spoke earlier, confirm that you actually got the unit pictured which would have a “remanufactured” Toyota tag on it.
 
Last edited:
Hey there! I didn't see any obvious Toyota markings on it. The regulator has a sticker branded with "SLF" on it.
 
If they charged $300+ , show a denso reman, and sent a generic unit (that may or may not be working), I'd flame them.

Since you're not going to post pictures to show us how it's hooked up, you might want to remove it and take it to a local shop, like AutoZone, and have it tested to see if it's working, before returning.

FWIW, this place charges $190 for a rebuild and does a fantastic job. Mom and Pop place has been in business for 60 years.


STARTERS AND ALTERNATORS

C.P. GENERATOR INC. Alternator and Starter remanufacturer Since 1962. Custom builder of High Amperage Alternators. UP TO 350 AMPS
www.cpgenerator.com
 
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