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04-11-2013, 09:09 PM | #101 | |
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Re: generator or alternator
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04-11-2013, 09:24 PM | #102 | |
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Re: generator or alternator
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'31 Fordor Deluxe 2W Briggs 170-B / blackwalls '41 Fordor Deluxe / 2-duece flattie '66 1/2 Dodge Charger '14 100th Anniversary Challenger Limited Edition. Semper Fidelis Last edited by Rock Hornbuckle; 04-11-2013 at 09:29 PM. |
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04-11-2013, 09:39 PM | #103 |
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Re: generator or alternator
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04-12-2013, 12:12 AM | #104 | |
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Re: generator or alternator
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04-12-2013, 02:46 AM | #105 | |
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Re: generator or alternator
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How's that rat rod coming along lol. Now wait a minute. Our resident electrical masters holders (who seemed to think that they got off easy) and us regular guys seem to have a consensus...on the 'coin flip'. HOWEVER none answered the second part of the question...HOW COME? How come Ford and all other auto makers... went from a good thing (positive ground) to negative ground |
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04-12-2013, 09:49 AM | #106 | |
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Re: generator or alternator
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I will drop over soon for a visit. |
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04-12-2013, 10:01 AM | #107 | |
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Re: generator or alternator
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I thought I addressed part of the how-come question: a change was made because of the desire for an industry wide standardization, at least in the U.S.. Apparently, no one knows why negative ground was chosen over positive ground, but there's no reason to believe that positive ground was the "good thing", and it's a fact that not "all other auto makers" went from pos to neg ground. Many had always used negative ground, including some quite respectable brands (e.g., Dusenberg), and several switched back and forth. It just doesn't matter! |
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04-12-2013, 10:50 AM | #108 | |
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Re: generator or alternator
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We agree on our conclusion, but part of the explanation is a bit off. EMF, or voltage, is a measure of potential energy difference between two places, whether or not any current is flowing. Actually, we have Ben Franklin to thank for assigning the electron to be negative, thus creating the confusion that in metallic conduction the particle movement is in the opposite direction to the conventionally defined current flow. The positive direction of current flow is defined as the direction in which positive charge is moving, or would move if it could. Steve |
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04-12-2013, 11:55 AM | #109 | |
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Re: generator or alternator
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Steve, you're totally correct about EMF being potential and not directional flow. I used the "flow" term as a way of deliniating the opposite of current, because some are confused about voltage and amps.
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04-12-2013, 01:26 PM | #110 | |
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Re: generator or alternator
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Al, Do you have to run engine up to 1000RPM to excite this alternator OR does it excite at a lower speed? THanks |
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04-12-2013, 01:37 PM | #111 |
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Re: generator or alternator
benson, I just installed the alternator on Wednesday and haven't driven my truck yet, probably this weekend, weather permitting. I did start it up and the ammeter is at "0" idling at 700 RPM's. I'm sure I had the RPM's above 1000 at startup, so right now I can't say if I need the excite the alternator to get it to charge. The way I start my Model A is to ALWAYS put the throttle lever down a few notches before I push the starter button, even when the engine is warmed up. So the alternator will always see 1000+ RPM's initially.
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04-12-2013, 02:44 PM | #112 | |
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Re: generator or alternator
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Well, I went for a short "putt" the other day and did not purposely ramp up the RPM on start-up. In order to excite the alternator on the '29. Once warmed up and going through the gears (2nd) the 'ol AMP meter needle jumped to charge in the buggy. Bob-A |
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04-13-2013, 01:42 PM | #113 |
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Re: generator or alternator
Gettin' up in the A.M, I have to "flail" my arms to "excite" my brain?? alternator, to get my brain?? dooley floppers goin' so's I can "race" to the INHOUSE! Why do we have to have mornings?????? Bill W.
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