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7/12/13 10:19pm - Original Message: 'Internally vrs externally alternator regulator'
rlu1968
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Gordonvillle, TX - USA

Vette(s):
1968 Roadster 427

Joined: 11/28/2003
Posts: 222
On the 68 it came with a low amp alternator with a external regulator. 
I am wanting to beef up the amps because I am going with the alum. radiator with Spal fans. 
If I went with a 100 amp alternator with internal regulator, what do I need to change out since the external regulator would no longer be feasible. 
What wiring change would I need to make it work. 
Would this have any effect on the console instrument amp gauge, using a higher amp alternator. 


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7/13/13 10:53am - Reply: 'Re: Internally vrs externally alternator regulator'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Hmmm...I'm having a brain fart right now....I know it can be done(and HAS been done).
One of the problems is that the external regulator has other duties, iirc, as a connection point for other stuff. Then again....my mind may be flaking out on me early this morn.
Perhaps someone else with a little less foggy memory will have the plan. If not, I'll see if I can figure it out. I do remember it's not a hard changeover.


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Joel Adams
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7/13/13 11:39am - Reply: 'Re: Internally vrs externally alternator regulator'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Joel Take a look at this to verify it will match up to 68 I found this I will keep looking at it also
 

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Bob R
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7/13/13 1:33pm - Reply: 'Re: Internally vrs externally alternator regulator'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152

This would be my updated as I read the 68 diagram Double check my work not sure of brown/wht wire, not sure if 68 has a gen light ? I think if their is no Gen light the Brown/Wht wire would be terminated at the regulator.

 





|UPDATED|7/13/2013 10:33:54 AM (AZT)|/UPDATED|


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Bob R
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7/14/13 11:57am - Reply: 'Re: Internally vrs externally alternator regulator'
rlu1968
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Gordonvillle, TX - USA

Vette(s):
1968 Roadster 427

Joined: 11/28/2003
Posts: 222
This looks pretty close to what I have except I have a black wire to the # 4 pin 
I believe this goes into the harness and on to the amp gauge in dash console. 
So if I updated to a 100 amp alternator perhaps a 69-82  and did away with the external  regulator I could use the hot wire from the starter/battery source to feed the positive on new alternator. I don't have a gen. light. I can get a ground from other sources, but what do I do in place of the dark blue and the white wire coming from the external reg. to the main plug in of the alternator. 
I notice some of the alternators now just have one wire hookup. 
Ecklers has some type of alternator conversion kit for the 68 used with 69-82 style alternators that looks like it might plug into the main plug. But this just seems to be a connection change rather then going external to internal. 
Thanks for the wiring diagram. 


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7/15/13 11:44am - Reply: 'Re: Internally vrs externally alternator regulator'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
here is a kit might have info with it or contact vender
 


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Bob R
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7/15/13 12:34pm - Reply: 'Re: Internally vrs externally alternator regulator'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449

Here is a how-to for the conversion from an external regulator alternator to a "SI" internal regulator alternator.

The bracket configuration is the same for the external and internal alternators.

The colors of the wires called out are the "standard" colors and I can't swear that your car's wiring loom matches.


When you convert from the external regulator alternator, you no longer need the regulator that is mounted on the radiator support or firewall.

Or,you could gut the inside of the regulator and solder a jumper from the F terminal to the 3 terminal inside the case.

Then do the same for the 2 other connectors internally. (2 and 4 terminals)

This would appear factory still with a cursory glance.

The diagram below shows the original connection at the old regulator.



The next diagram shows how you modify the loom at this location.

Unplug the connector from the regulator. Either make a jumper with spade terminals that plug into the harness terminals, or cut the wires and connect them together in the following way:

Notice that the Blue wire is jumpered to the Orange wire. The White wire and the Brown wire are jumpered together.

This next diagram shows what you have to do at the new alternator.

The white wire above, now should go to the new alternator terminal 1.

The Blue wire will go to the '2' terminal on the alternator.

You will need a new connector to fit the new alternator and they can be purchased at almost any auto parts shop.

In order to ensure good connections, I recommend that you always solder the connections and then use heat shrink tubing to seal it.



dang...pics are BIG! Need to modify this a widdle....sorry.



|UPDATED|7/15/2013 9:34:26 AM (AZT)|/UPDATED|


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Joel Adams
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7/15/13 5:02pm - Reply: 'Re: Internally vrs externally alternator regulator'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Hey Joel From the diagram I did above and yours I believe if their is no "Gen Lt" Their would be no connection to the Alt plug Term 1. I believe that provides Grnd for a Gen lt. Therefore the Wht or Wht/Brn wire from Term 4 of Regulator would be terminated(not used) it is 12vdc from Ign Sw in run and ACC. their would only be a wire in term 2 of plug at ALT. Term 2 is the volt sensing. does this seem correct to you?

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Bob R
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7/15/13 10:39pm - Reply: 'Re: Internally vrs externally alternator regulator'
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Right, Bob..the brown wire would not be used with a GAUGE, only with an idjit light. I kinda went thru the diagram quickly at lunch, so I dint really have time to "finesse" it the way it should have been, but the basic concept is there. Thumbs Up

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Joel Adams
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7/16/13 7:32pm - Reply: 'Re: Internally vrs externally alternator regulator'
rlu1968
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Gordonvillle, TX - USA

Vette(s):
1968 Roadster 427

Joined: 11/28/2003
Posts: 222
Now an alternator place in Richardson Texas said all I need was a 120 amp. alternator for my add ons. 
They could provide a internal alternator with a one wire hot wire.
Said the amp gauge would not work in the dash console, and i would no longer need the external regulator and I could leave it in place so it all looks original. 
I am sure there would be a ground wire somewhere. 
I wonder if it would still be best to cross over the wires in the  plug  to the external reg. as in your diagram. Or just leave the plugs and wires attached to the external reg. 
Great diagrams
Thanks so much for all the input. 


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7/16/13 10:48pm - Reply: 'Re: Internally vrs externally alternator regulator'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
The one-wire set-up will ground the alternator thru the brackets....shouldn't need a separate ground wire. Just un-plug the connector that goes to the old alt, and connect the one red wire. You should be able to leave the old external reg plugged in, and on the car, with no adverse effects. If you do go this route, please ask them if the one-wire alt they provide will drain the battery over time.....I've head MANY stories about folks using one-wire alternators that would drain the battery in a couple of days(or overnight), and also heard that some alternators will "buzz" with the key off, due to them still being active. Never actually had these problems myself, but...

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Joel Adams
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(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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7/17/13 12:30am - Reply: 'Re: Internally vrs externally alternator regulator'
rraider1
Former Member
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
These 3 sites will help answer any questions or might get you more confused but we will help you through it somehowLOL
 
 
 


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Bob R
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