I recently changed over to 12v on my '53 239 and i got a free 12 v generator that has sat for a number of years. It worked the last time it was on a motor. Its all hooked up and i took a base reading from my battery of 11.60V, with the motor running it slowly drops from that by .01V steadily about every 30s or so. When i throttle the motor up the reading jumps back to 11.60/11.61V until i let off and it drops back to where it was before i throttled and keeps dropping slowly. Im not very familiar with generators over alternators, so i am unsure if this is normal. Any suggestions? I would like to keep the nostalgia look of the generator over the modern look of an alt.
Generators will usually need more RPMs to out put the correct voltage, but I should let you know that 11.6 volts will kill a 12v battery rather quickly. You want 13.6-14.4 volts while runing to keep the battery healthy
k this is what i did for my generator. The one i spoke about was a chevy one i was trying to mod just so it worked. The generator turned out to be no good so i bought a set of 12v field coils and installed them on my 6v gen and it works great.
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