Checking 6 volt neg ground output with multi meter Can anyone let me know the best way to check a 6 volt neg ground output with multi meter on my 1931 "A" with an alternator. It seems my battery is not charging and getting weaker as time goes on.
Thanks in advance. |
Re: Checking 6 volt neg ground output with multi meter The easiest way is to measure the voltage of the battery directly with your MM.
Connect - you measure the resting voltage. Start - you measure the stability / quality of the battery. Increase RPM - the voltage must rise when the generator supplies power. . |
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Take take your volt meter and connect it across the battery, take a reading. Start engine and set to a fast idle and take another reading. Let us know the results and we can go from there. What the the vehicles ammeter show ? The only reason I'm suggesting taking the readings directly from the battery is due to the possibility of poor/dirty connections. |
Re: Checking 6 volt neg ground output with multi meter To charge the battery, you will need about 7.2 Volts from the alternator as measured on the battery terminals.
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I looked at Snyder's, Bratton's and Berts and their 6 volt alternators are positive ground. |
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Well we'll find out. Maybe thats the problem. |
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Re: Checking 6 volt neg ground output with multi meter I agree with Bob mine has been on for years (+ ground )
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Re: Checking 6 volt neg ground output with multi meter To insure you have a good battery, here is an inexpensive battery load tester. Does 6 and 12v. A lot of auto parts chains and farm supply store do not have 6v testers. You can do the same thing measuring battery voltage droop running the starter with ignition off.
https://www.harborfreight.com/100-am...ter-61747.html |
Re: Checking 6 volt neg ground output with multi meter Ah, the 6v alternators from Bratton's and Snyder's are Nu-Rex conversions. That explains it. I was thinking TLR might have a polarity issue. He still may. Maybe we'll find out what the problem is.
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Re: Checking 6 volt neg ground output with multi meter Sorry it is positive ground..........checked per jrelliott and we are getting 7.1 volts so we should be charging. Just seems to crank slower than it should, maybe the starter is getting tired?
Thanks for the replies |
Re: Checking 6 volt neg ground output with multi meter Do you have the modification adding a ground cable between where the battery ground attaches to the fame, to the bell housing? And have you cleaned the battery cable connection on the battery and cable frame connection. Also the Starter cable connections on both ends?
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We still don't know what the ammeter is showing or where the 7.1 v reading was taken from. |
Re: Checking 6 volt neg ground output with multi meter 7.1 is a tad low - 7.2-7.9 is min-max for good charging. Should charge the battery ok, but more slowly. Maybe much more.
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Re: Checking 6 volt neg ground output with multi meter Make sure spark advance lever is fully retarded when starting. Otherwise it will crank slow and is also hard on the engine.
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Re: Checking 6 volt neg ground output with multi meter First you should use an Analog multimeter. A digital meter will not read steady unless it has a good filtering circuit. Most 6 volt positive alternators (don't know about 6 volt negative alternators) have internal leakage and drain the battery over a few days. If you have the starter mounted fuse, remove it when your done driving for the day, and reinstalled when your ready the start the Model A the next time you start the car.
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