Re: Charge rate for "49 Custom 8

Posted by Fish'n Jim On 2020/10/15 19:51:55

I assume you have a "problem" with it and not just out testing for the curiosity of it?
Not sure I understand how you're measuring, but I think you're not measuring full amps if using the "gauge" leads. That's not really an "ammeter". It measures relative direction of current flow. A coil creates a field as the current flows and the magnetic needle moves with the field polarity. More current stronger field, more deflection. When needles in the "center", it's supposedly fully charged up but can still be drawing low amps. I think you have to measure on the output lead. If you have a clamp type ammeter it's easier than putting DVM in series.
I recall that '49 gen is rated 30 or 35 A. So if pulling 20, not much left at idle. If you need more power, then ether change the gen or have rewound. I think there's an amp v rpm chart, in the shop manual, I seen it, not sure where. Maybe Delco?
Take to the local parts store that has diagnostic tools and let them put their battery machine on it. They can test 6V.
Or an auto electric shop and let them test it all. Some charge, some don't.
Another thing to do is have someone pedal the gas while parked in neutral and observe the lights from the side (safety) They should not go dim at idle. A small difference is ok. I'd suspect the battery if dimming alot.