Black Box

[Gert]

In my through Nick Veuger modified Midget 1275, my alternator blew up several times now. The Diode-bridges went down, my mechanic said. What is goning on? All wires are new, Ignition is 123. Suddenly my mecanic saw a black box, deeper down the engine bay, connected to the system. Nobody understands the meaning of it. Is my Midgy connected to the NSA? Is someone following me from behind a screen? What did Nick Veuger do?

 

[dklawson]

Can you post pictures of the black box and list each wire color connected to the box?

 

[Rut]

Gert,
A wild guess here, but I bet the black box is the voltage regulator which is normally bypassed in a generator to alternator conversion. Alternators (ones im families with) have built in regulators and the original is not needed.
Rut

 

[dklawson]

That's what I was wondering about. There were a handful of early Lucas alternators that used external regulators but they are not common.

EDIT: The early alternators with remote regulator (might be a 15AC) were made around 1968 and some sources report they had an external regulator called a 4TR. See the link below for schematics and information.
https://www.mgexp.com/phorum/read.php?1,2189130

 

[nomad]

Something is definitely amiss with the wiring if it is blowing out the diodes. The alternator should feed directly to the battery and the old regulator eliminated.

Kurt.