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single field vs dual field alt... #1243837 06/01/12 10:36 PM 06/01/12 10:36 PM
Joined: Jan 2003 Posts: 4,150 lewiston, ID C cornucopia OP
cornucopia OP C Joined: Jan 2003 Posts: 4,150 lewiston, ID	can I use a dual field alt on a pre-70 mechanical regulator system? I don't want to change the harness over to the electronic. I seem to recall reading about just grounding one of the field terminals and all will be well... maybe I am hallucinating...

Re: single field vs dual field alt... [Re: cornucopia] #1243838 06/01/12 10:38 PM 06/01/12 10:38 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	You are correct.... Though actually what is commonly referred to as a dual field alternator is actually an isolated field alternator & only differs for the earlier design by not having one end of the field winding grounded.... Last edited by 1_WILD_RT; 06/01/12 10:43 PM. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: single field vs dual field alt... [Re: 1_WILD_RT] #1243839 06/01/12 10:54 PM 06/01/12 10:54 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: You are correct.... Though actually what is commonly referred to as a dual field alternator is actually an isolated field alternator & only differs for the earlier design by not having one end of the field winding grounded.... That isn't technically true, the isolated field setup varies the resistance to ground to control the output, the early version switches the 12V to the field on and off to "chop" an output of whatever is needed. The isolated setup is still grounded, but thru the voltage regulator. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: single field vs dual field alt... [Re: Supercuda] #1243840 06/01/12 10:58 PM 06/01/12 10:58 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Quote: You are correct.... Though actually what is commonly referred to as a dual field alternator is actually an isolated field alternator & only differs for the earlier design by not having one end of the field winding grounded.... That isn't technically true, the isolated field setup varies the resistance to ground to control the output, the early version switches the 12V to the field on and off to "chop" an output of whatever is needed. The isolated setup is still grounded, but thru the voltage regulator. Your talking about what the regulator does, not how the alternator is built... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: single field vs dual field alt... [Re: cornucopia] #1243841 06/01/12 11:26 PM 06/01/12 11:26 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	yes ground the extra field terminal with a short piece of wire to the alt case & can probably remove the insulating washer to ground the brush/brush holder itself for a cleaner appearance live every 24 hour block of time like it's your last day on earth

Re: single field vs dual field alt... [Re: RapidRobert] #1243842 06/02/12 12:05 AM 06/02/12 12:05 AM
Joined: Feb 2003 Posts: 8,681 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,681	and it doesn't matter which one you ground or hook the field wire up to, just pick one.

Re: single field vs dual field alt... [Re: Andrewh] #1243843 06/02/12 01:59 AM 06/02/12 01:59 AM
Joined: Jan 2003 Posts: 4,150 lewiston, ID C cornucopia OP
cornucopia OP C Joined: Jan 2003 Posts: 4,150 lewiston, ID	cool! I have 14 dual field alts in the collection, and no singles... I will make it work.

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