Mix and match on C2 engine electrical.

[67HEAVEN]

Which is the appropriate replacement alternator to use in this original L-71 car that had the 1100696 alternator (used with K-66 cars)? It is a 42amp unit.

Combine this with a complete set of new wiring harnesses for the entire car....a new MSD Billet Corvette distributor (tach take-off model); new MSD Ignition Amplifier and new stock horn relay and coil.

Just go with a replacement 42amp unit? Thanks for all opinions.

 

[midyear]

You are worried about an orig alternator??? As for me, I would put as high amp an alt as possible. You are running electric fans, high output ignition, ect. I would install a late 80's internal regulated alt rated for 100 amps or so. Its eay to convert your wiring, or just get a one wire alt. You have updated almost everything else, why not a modern alt as well. Let me know if you need a chart for changing your wiring.

 

[67HEAVEN]

But Dennis, won't the NCRS judges know something's been changed?

Seriously, if I take your advice about an internally-regulated alternator, how will I deal with the new wiring harness that (like the original harness) allows for the external regulator?

Also, dimensionally, are the later alternators going to require a change in mounting brackets, or will the original barckets work okay?

Thanks. We don't get to hear from you often enough around here.

 

[midyear]

Bob,

An internal reg alt will bolt directly in place of the external reg alt. With a one wire alternator like you get from Jegs or Summit, all you need is the large red wire and you are working. If you use a GM style from a parts house, you will use your large red wire, and only one of the existing small wires. The wire plug on the alt uses 2 wires, the wire farthest away from the main bat term on the alt can be run right back to the main bat term on the alt. The other wire is a key on trigger wire. I use one of the existing wires, trace it back to the regulator plug, clip it and tie it into the key on wire already present at the same regulator plug. then you can eliminate the plug and tape up remaining wires neatly for a factory looking install. If you need an aplication to use from your parts house, Try an 86 monte carlo SS or an 86 fiero, ask for a 95-100 amp alternator. You may need to have it clocked to work with your brackets but its a simple thing to do.

Are you going to make Carlisle???? I am looking forward to seeing your car in person!! My current project is stalled out. Wanted to build a grand sport replica from my 64 coupe. Nobody offers body panels anymore. So I finished off orig body, almost ready for paint, frame done and back under car, interior purchased, car will be orig color of black, but I changed int from black to saddle, now torn on running gear, have a 95LT1 w/700r4, or use a 327 w/4 speed. one combo is safe, the other should be more fun. I doubt it will be finished by Carlisle (although I do have 6 weeks!!) so I am sure I will drive old faithful (my yellow 67 roadster).

Dennis

 

[Mac]

If you go to a single wire alt, you might want to consider putting an in-line diode. Depending on what your new ignition wants, it's cheap insurance.

-Mac

 

[67HEAVEN]

Good info, Dennis.

Other than possible clocking, will the 86 Monte Carlo SS or the 86 Fiero (95-100 amp) alternators have similar pullies to my application?

I'm sorry to say that I won't be attending Carlisle this year. Even if I get the car finished in time, there is no way I'm taking a 20-hour round trip without the time to work out the kinks of all the modifications I've made to this car. Besides, my wife is tapping her toe while watching the calendar - I've been telling her, "Yes Dear, I'll get to the honey do list as soon as this four year project is completed......honest!!!" If I take off for Carlisle after all this, I'll end up living in my car.

Mac,
Any specifics on the inline diode suggestion?

Bob,

An internal reg alt will bolt directly in place of the external reg alt. With a one wire alternator like you get from Jegs or Summit, all you need is the large red wire and you are working. If you use a GM style from a parts house, you will use your large red wire, and only one of the existing small wires. The wire plug on the alt uses 2 wires, the wire farthest away from the main bat term on the alt can be run right back to the main bat term on the alt. The other wire is a key on trigger wire. I use one of the existing wires, trace it back to the regulator plug, clip it and tie it into the key on wire already present at the same regulator plug. then you can eliminate the plug and tape up remaining wires neatly for a factory looking install. If you need an aplication to use from your parts house, Try an 86 monte carlo SS or an 86 fiero, ask for a 95-100 amp alternator. You may need to have it clocked to work with your brackets but its a simple thing to do.

Are you going to make Carlisle???? I am looking forward to seeing your car in person!! My current project is stalled out. Wanted to build a grand sport replica from my 64 coupe. Nobody offers body panels anymore. So I finished off orig body, almost ready for paint, frame done and back under car, interior purchased, car will be orig color of black, but I changed int from black to saddle, now torn on running gear, have a 95LT1 w/700r4, or use a 327 w/4 speed. one combo is safe, the other should be more fun. I doubt it will be finished by Carlisle (although I do have 6 weeks!!) so I am sure I will drive old faithful (my yellow 67 roadster).

Dennis

 

[Sting Ray]

Dennis,

Check out E-Bay 248320480, might fit the bill, but would be a rush to finish by Carlisle

Sorry to Hijack the thread Bob,

Tom

 

[Tyler Townsley]

If you have the original alt. take it to a good alt shop and have them upgrade it to a 100 amp unit. That way it stays original on the outside but you get the additional amps. Done this with a 66 and a 68. Cost was $75-$100.

Tyler

 

[IH2LOSE]

Bob,

An internal reg alt will bolt directly in place of the external reg alt. With a one wire alternator like you get from Jegs or Summit, all you need is the large red wire and you are working. If you use a GM style from a parts house, you will use your large red wire, and only one of the existing small wires. The wire plug on the alt uses 2 wires, the wire farthest away from the main bat term on the alt can be run right back to the main bat term on the alt. The other wire is a key on trigger wire. I use one of the existing wires, trace it back to the regulator plug, clip it and tie it into the key on wire already present at the same regulator plug. then you can eliminate the plug and tape up remaining wires neatly for a factory looking install. If you need an aplication to use from your parts house, Try an 86 monte carlo SS or an 86 fiero, ask for a 95-100 amp alternator. You may need to have it clocked to work with your brackets but its a simple thing to do.

Are you going to make Carlisle???? I am looking forward to seeing your car in person!! My current project is stalled out. Wanted to build a grand sport replica from my 64 coupe. Nobody offers body panels anymore. So I finished off orig body, almost ready for paint, frame done and back under car, interior purchased, car will be orig color of black, but I changed int from black to saddle, now torn on running gear, have a 95LT1 w/700r4, or use a 327 w/4 speed. one combo is safe, the other should be more fun. I doubt it will be finished by Carlisle (although I do have 6 weeks!!) so I am sure I will drive old faithful (my yellow 67 roadster).

Dennis

Dennis does he have to do anything to the voltage gauge when converting to internally regulated alternator?

Bob You can send out your original altrnator and have it rebuilt to a 90 amp output.I always do this with my everyday driver for its plowing and salting duties.


PS dennis why dont you guys (blue stripe, and I forgot the other guys handel) visit here more often

Ill see you in Carlilse

Bob

SORRY FOR THE THREAD HIJACK But I needed a good excuse to post these pictures

 

[magicv8]

I'm using a 135 amp replacement Delcotron with (2) 60 amp stinger fuse holders. One has the factory harness line, and the other has the Derale fan and auxiliary headlamps. You can see the bracket the fuse holders hang from at the Details page linked off my homepage (shown below).

 

[Mac]

Mac,
Any specifics on the inline diode suggestion?

It may not be an issue for your ignition system but it's worth a read of the instructions. Basically all the diode does is prevent any voltage from going the wrong way, so to speak. Inversions can cause bizarre problems with any kind of electronics.

Any decent autoelectric shop can sell you a diode which you plug in-line or hardwire (your preference). For my wife's Jeep (which I converted to fuel injected, mixing two different wiring harnesses) I bought one which plugged directly into the alt output. They had them on the shelf for most applications.

-Mac