Re: Can't get 1953 Super A to charge

Posted by Kingmopar on November 28, 2017 at 22:37:08 from (71.54.152.173):

In Reply to: Re: Can't get 1953 Super A to charge posted by jwitty on November 26, 2017 at 07:59:11:

Nope....unplugged the GM connector on the side of the alternator, used a jumper to touch #1 to the BAT terminal on the alternator...still nothing. Naturally, have been trying to do a bunch of reading on this
subject. One forum says use a 1N5408 diode back to the switch and even a aftermarket place sells a "kit", with this same diode, but a old school warning light, will do..the same thing. Some other rodder
forum, state that one should use anywhere from a 50 to 300 ohm resistor(to simulate an old school warning light) to prevent damage to the rectifier circuit of the alternator...which the forums and diagram
here, say use a 10 ohm, 2 or higher watt resistor...which mine is 11 ohm(freebie)and rated at 3 watt. Apparently, this has worked for some folks, but not so far, for me. I was like...what the heck...50 to
300 ohms for a tiny warning light?? I know that as a light, "makes light"...it's resistance changes and goes up. I had an extra 70's Mopar A body instrument clusters around...but...I couldn't get a reading
on my ohm meter on any of the bulbs, in their holder...well, they are 57 years old, so that was a bust, probably toast anyway, or my meter is crap. I did find that most GM clusters of the late 70's and
early 80's used a 194 bulb, used in a holder, that twist locked on the back of the circuit board, on the cluster, just like my Mopar cluster. Not sure if bulbs are the same. The spec on this bulb(194) says
it is rated at 3.8 watts/14 volts, and is of 2 candle power. I found a Ohms Law Calculator on line: http://www.bowdenshobbycircuits.info/ohmslaw.htm Low and behold...putting in this bulbs needed (2)
specs...basically comes out to basically 51 ohms of resistance....so..."maybe"...I messed up the rectifier bridge, by using too low a resistor. I "borrowed" our optical tach to measure pulley speed...but..I
have to paint the front of the pulley flat black...place a small piece of reflective tape on the front of it...to get the proper speed of the alternator pulley at idle, and full speed to see if I am at the
alternator's working RPM range. It shouldn't be...this darn hard!!!-LOL! When I was a kid...you could go into any auto parts store..and get all grades of "warning lights", different colors, all 12 volts
with included bulb and wiring, to mount to a panel. Even lighted switches had bulbs in them....but now...that tech is long gone. Nobody makes this stuff anymore. Everything...has gone to LED and just
doesn't off the resistance needed.

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