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Clooney, John T. Anyone, alt. question?

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Wayne in Tn.

07-15-2003 15:33:28




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My friend who owns the local junkyard, is having Delco alternators rebuilt. They are supposed to be built back as a (one wire) but they still have the plug like this: [--] Question is one of these posts supposed to be (hot) all time, with a small jumper wire back to the (hot) post on the rear of the altenator? The reason for this question is it will not excite itself at WOT. I still have to excite it by sparking one of the small terminals. If so, which one should it be? The plug, looking at it from the side, with the pulley facing your right [--] is actually vertical, not horizonal, so would it be the top or bottom terminal that should be (hot) all time?

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Bus Driver

07-16-2003 04:29:31




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 Re: Clooney, John T. Anyone, alt. question? in reply to Wayne in Tn., 07-15-2003 15:33:28  
The instructions that came with a one-wire alternator converted to 6 volt output are that both of the terminals should be momentarily and simultaneously connected to battery voltage. Both are connected to battery voltage in the original, unconverted, configuration.



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Clooney

07-15-2003 16:34:10




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 Re: Clooney, John T. Anyone, alt. question? in reply to Wayne in Tn., 07-15-2003 15:33:28  
Wayne, most 1 wire Delco alternators don't use a wire to either one of those - - terminals. Those terminals are still there on most 1 wire conversions though but are usually covered with a plastic cap.
~I really don't know what you have there, your best & safest bet is to call the guy that converted it & ask him what you have.
~There were some early conversions that did need a power wire run from the [Bat] post on the back of the alternator to the #2 terminal.
~Even on the later properly converted 1 wire alternators sometimes you have to run a jumper wire to the #1 terminal to energize the rotor for the first time, it should energize itself after each start after that.
~I really don't want to give you terminal information just based on position as that depends on the case rotation & terminal placement. If you look closely there should be a number next to each terminal. It will be either a #1 or # 2.
~If you can't contact the guy that converted the alternator you should first try running a jumper wire to the #1 terminal & see if it charges, if so then remove the jumper & see if it will energize itself the next time you start it, if so that is probably all it needed.
~If the above doesn't get it charging on it's own run a jumper from the [Bat] post on the alternator to the #2 terminal & see if it will self energize then. If so you can run it like that but you really should contact the guy that converted the alternator...

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John T

07-15-2003 16:28:15




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 Re: Clooney, John T. Anyone, alt. question? in reply to Wayne in Tn., 07-15-2003 15:33:28  
Hi Wayne, Im just back from the New York Expo and Niagra Falls and just gettign back on line. Anyway, if its the GM 10 SI "internal regulated" alternator (NOT one for an external Voltage Regulator), the two terminals are NOT as you have drawn but vertically aligned

! (1 or R) Top ! (2 or F) Bottom

top and bottom if looking at the side with the pulley to your right and the shaft running horizontal. On those, its the BOTTOM (2 or F) that is always HOT since its jumpered direct up to the big rear charge wire terminal that hooks to the battery via the load side of the ammeter. The top (1 or R) is the one that needs excited by hooking it to a hot (when ignition is on) terminal in series with a 10 ohm resistor (to protect diode trio) and a diode to prevent running when the ignition is turned off assuming the hot supply is the coil.

I thought the GM alternators with the side to side (not top n bottom) terminals are for external voltage regulators.

John T

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Wayne in Tn.

07-15-2003 16:42:22




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 Re: Re: Clooney, John T. Anyone, alt. question? in reply to John T, 07-15-2003 16:28:15  
Thanks, Clooney and John T. I will try what you said. Also you are correct, John T. the posts are vertical, I just could not draw it that way on the computer. I will post my results....



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