78 alternator replacement w Valeo wiring?

[911TerryT]

Hello, I am Replacing a 78 alternator with a Valeo alternator. I have Read about the internal and external voltage regulator differences. I am Still confused if I go with Valeo internal regulator, what do I do With the black wire that is for external regulator? Also, what problems may I have With my gauges if I select the newer internal regulator. Thank you.

[john walker's workshop]

Just fold the black wire back and remove the old regulator. No need for the black wire. No difference in the gauges

[911TerryT]

Thank you for response. Does the alternator light in the gauges now become inactive with dead heading the black wire?

[john walker's workshop]

The light is in the blue wire circuit.

[Targalid]

Alternator shaft is a different diameter. The Valeo fan/alternator/pulley nut is 24 mm instead of the 22 you had.

[john walker's workshop]

Yeah, the cup washer hole probably needs to be enlarged to fit the new shaft. Die grinder or rat-tail.

[carlvs]

The SEV Marchal alternator on my 78SC ROW failed about two weeks ago. Replaced it with a
Brand: Bosch
Part Number: AL9341X
Item Condition: Remanufactured
Item Description: Alternator
Manufacturer Brand Description: Reman Alternator
Quantity Needed: 1;
Fitment Notes: Optional;70 A;
Cost $164.84 including shipping on eBay.
Works great, so far.
The nut was included now 24 mm wrench size instead of 22mm.
Used the existing external regulator.



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[Targalid]

I enlarged the cup washer described by John Walker using a round file in a motel parking lot. I highly recommend the die grinder alternative in your own shop,