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'62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: brocklanders ()
Date: June 19, 2017 07:51AM



So I'm about to start this conversion, but not having much experience with the early wiring it's hard to know what to change, mostly to do with the resistor wire to the acc switch. I don't know if that's to be added or already exists.
Also: is there a preference or need to change from early to late regulators? I have both, and I know they ground differently.

I've attached the diagram I'm planning on using.
Thanks!

1968 Corvair 500 coupe 140 4 spd
Bowmanville, Ontario, Canada


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: martyscarr ()
Date: June 19, 2017 08:50AM

Have you seen this page written by one of our forum members?

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: 66vairman ()
Date: June 19, 2017 09:23AM

This came up recently. Most of the explanations don't mention the resistance wire in a parallel circuit with the warning lamp that the LM cars have (wire in harness). This is needed on EM cars to assure adequate amperage to the alternator "field" circuit to excite the alternator (turn it on). Some just put in a lower ohm bulb and get by.

The general consensus is to use a 10ohm 10WATT resistor in parallel with the warning lamp. I prefer a wider safety margin and use a 10ohm 20WATT resistor. Doesn't cost much more and won't overheat if there is a short in the wiring.

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: brocklanders ()
Date: June 19, 2017 10:04AM

martyscarr Wrote:
-------------------------------------------------------
> Have you seen this page written by one of our
> forum members?


Yes, and again, the diagrams only use the regulator as a junction block. This means it's an internally regulated alt.


Ok, so the resistor is needed, fantastic.
As for the rest, it looks pretty straight forward for wiring. Instead of a junction box, can I simply use the pos battery connection as a junction and feed the alternator off that?

Thanks guys!

1968 Corvair 500 coupe 140 4 spd
Bowmanville, Ontario, Canada


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: brocklanders ()
Date: June 19, 2017 10:06AM

Also, I don't have an Acc. On my ignition switch, where should that resistor actually go?

1968 Corvair 500 coupe 140 4 spd
Bowmanville, Ontario, Canada


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: cnicol ()
Date: June 19, 2017 10:17AM

You don't HAVE to have a resistor. You can try without and if the alternator doesn't "energize" (start charging) right after you start the engine, you can try a higher CP bulb. If that doesn't do the trick then you can add a resistor in parallel with the bulb to ensure charging after start. It's easy to tell if the alternator is energized because the warning light goes off.

I've never installed a resistor and the worst case is having to "zoom" the throttle to about 2000 RPM, which will also energize the alternator. FWIW, "One-wire" conversions all require the throttle zoom, which is one of their weaknesses.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: brocklanders ()
Date: June 19, 2017 10:29AM

Excellent info Craig, I'll try it and see what happens then reassess.
Thanks!

1968 Corvair 500 coupe 140 4 spd
Bowmanville, Ontario, Canada


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Lane66m ()
Date: June 19, 2017 11:07AM

Here is the latest diagram put together. With part numbers 5o help you find parts.

[corvaircenter.com]

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1966 Corsa Turbo Coupe, 180 hp 4 Spd
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1968 Camaro SS Coupe 350 CI 295+ HP PG
1947 Farmall A tractor 15 hp


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Timothy Shortle ()
Date: June 19, 2017 12:16PM

Your car is a 1968, your diagram is for a late model, and your topic is titled '62.
What exactly are you working on? If it is a 62, you have the WRONG diagram. If you're going to convert to an internal voltage regulator, WRONG diagram.

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: cepak ()
Date: June 19, 2017 12:40PM

This is the diagram I used to wire my '63 and everything worked perfectly.



Tom Cepak

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Frank DuVal ()
Date: June 19, 2017 01:03PM

I am lost on the reason to use an external regulated alternator when internal regulated alternators are so cheap to purchase compared to purchasing an internal regulated alternator and a regulator.

Yes, one does need a donor externally regulated alternator to get the proper fan, just like one needs the oil filter adapter in order to mount either alternator on a generator equipped engine.

Frank DuVal

Fredericksburg, VA

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: brocklanders ()
Date: June 19, 2017 01:10PM

I have yet to update my sig, this is a later 95 engine in a 1962 chasis.

Ok, so I have it wired as follows. I have yet to test it due to other wiring happenings, but it's best to double check before anyways:

Alt 'A' to "A" on REG
Alt 'F' to 'F' on REG
Alt Batt to battery connection (i'm using the pos clamp as a junction)
Alt ground to chasis ground

Nothing else is changed.

I feel like there should be more to it than that....

1968 Corvair 500 coupe 140 4 spd
Bowmanville, Ontario, Canada


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: MattNall ()
Date: June 19, 2017 01:11PM

YES you need a different Regulator!! One like on your other LM's!





MODERATOR
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Click HERE for My Website...Click HERE for My TechPages!
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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: cepak ()
Date: June 19, 2017 01:13PM

Frank DuVal Wrote:
-------------------------------------------------------
> I am lost on the reason to use an external
> regulated alternator when internal regulated
> alternators are so cheap to purchase compared to
> purchasing an internal regulated alternator and a
> regulator.
>
> Yes, one does need a donor externally regulated
> alternator to get the proper fan, just like one
> needs the oil filter adapter in order to mount
> either alternator on a generator equipped engine.


I misread the title. I agree with Frank.

Tom Cepak

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Timothy Shortle ()
Date: June 19, 2017 01:41PM

I usually add my 12 volt wire to run IN FRONT OF THE MULTI PIN CONNECTOR. This way 1 less potential issue (the multi pin connector is a "problem" area as far as loose, melted connector). I also run the "small, brown" wire to in front of the multi pin connector. I tape these 2 wires together to look like a clean job. Finally, I get these 2 wires with connector from a junkyard donor car where I make sure I get enough wire to not have to add to this. Every connector added is a potential (future) issue. The internal regulator is such an easy clean addition (so I agree with Frank D.). Another reason is parts for these are (maybe) more reliable and more readily available.

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Frank DuVal ()
Date: June 19, 2017 02:25PM

Um, there is no "A" on a GM alternator regulator, as used on most GM cars from 1962 to 1972 or so.

The generator regulators (on your car from the factory) are VERY DIFFERENT than the regulators on alternator equipped cars. You can not use a voltage regulator from a generator system on an alternator.

Frank DuVal

Fredericksburg, VA

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: cnicol ()
Date: June 19, 2017 03:11PM

Wow, this thread is all over the place. Note that the posted diagram a few posts up and the linked diagrams are all incorrect for what you are trying to do.

And yes you do need an ALTERNATOR regulator.

Here's how your proposed combo is supposed to be hooked up:

Output post on alternator to the + battery terminal

Fat black body harness wire (was on your old regulator BAT) to battery + terminal

4-terminals on the new regulator:
F to alternator F
2 to alternator R
3 to battery + terminal (small gauge wire is fine)
4 to little brown wire that was connected to old regulator's A terminal.

Make sure the new regulator is grounded to the body (usually by simply bolting it to the body)

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts




Edited 1 time(s). Last edit at 06/19/2017 03:19PM by cnicol.

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: cnicol ()
Date: June 19, 2017 07:14PM

Here's how to wire an LM style alternator and regulator into an EM or FC.

The existing black (or red) 10 gauge wire and 18-gauge brown wire in the body harness may have to be extended to reach. The other wiring is all new. Use proper terminals and careful technique. None of this stuff is fused.


Output post on alternator to the battery + terminal

Fat black or red body harness wire (was on your old regulator BAT terminal) to battery + terminal

4-terminals on the new regulator:
F to alternator F
2 to alternator R
3 to battery + terminal (small gauge wire is fine)
4 to little brown wire body harness wire that was previously connected to old regulator's A terminal.

Make sure the new regulator is grounded to the body (usually by simply bolting it to the body)

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+17 Tons of parts

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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: Andrew B ()
Date: June 19, 2017 07:25PM

Hey,

I am very weak in understanding electronics so I find this thread very interesting. First I searched what the benefit of an alternator is over a generator. Then started reading Geoffrey A. Johnson page on the conversion and wanted to know what a 10SI is and a 12SI. I found this page which had a bunch of information on alternators.

Delco REMY models 10SI & 12 SI alternators

It may be old news to you but I thought it was a good read.


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Re: '62 Generator converted to Externally regulated Alternator wiring Diagram?
Posted by: caroseiii ()
Date: June 19, 2017 09:15PM

This shows the relative merit of the generator. So much easier to wire up!

Crawford

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