View Full Version : Alternator Conversion - Generator Control Box?

03-18-2006, 12:22 AM
This is a slightly different question about alternator conversions.

I converted my GT6 to a Delco alternator several years ago. I've had no problems with what I did... but I didn't do anything special with the wiring to keep things looking original either.

On the Mini I gutted the Lucas generator control box and used it as a junction box for the wiring so I didn't have to cut or splice the harness. This give the engine bay a much more original look. It also has the advantage that it's much easier to put the car back to a stock configuration.

I have a friend who wants me to help him do an alternator conversion and I want it to be neater than what I did on my Triumph. I haven't found any articles talking about gutting an old Triumph control box and using it as a junction for the wiring.

After studying the diagram for my car it looks like I should gut the control box and run heavy shunt wires between the two heavy gauge spade lug terminals. Similarly, it looks like I should install a shunt between the two small gauge spade lugs... leaving the ground/earth lug disconnected. (All this with the coils and such removed from the old, dead control box). It should then be a matter of leaving the wires in their original positions on the control box and plugging the generator wires into the back of the alternator (heavy wire to a big lug, small wire to the field coil spade lug). Optionally, we can run an extra heavy gauge wire from the remaining alternator output terminal to the hot side of the starter solenoid.

Am I missing anything? Has any Triumph owner used a dead, gutted control box as a junction box or is the something only done with the BMC cars... and if not... why not?

03-18-2006, 12:27 AM
Mr Masters ,calling Mr. Masters

03-19-2006, 10:18 AM
Funny you should mention that...

While googling on this subject, Dan's name came up on several links. Sadly, a number of the links that sounded promising were on the VTR site which now wants you to login with a user name and password. I'm not a member.

Dave Russell emailed me some advice off the board and suggested some other areas to search. Thanks Dave.

03-19-2006, 12:23 PM
I converted my TR3 to a one wire alternator a number of years ago and gutted the control box and used it as a junction box. I don't remember where I put my wiring notes -- but it shouldn't be too difficult to see what is connected to what after I get the car out from storage. I do remember running a new, heavier single wire to the alternator and not using the original generator wire.

03-19-2006, 01:01 PM
When I converted my TR6 to a 63 amp Delco-style alternator, I chose to bypass all the original TR wiring (even though I have a new harness) and chose instead to use a new, heavy-duty double positive lead to the battery, the smaller of which (8-gauge wire) I used to accept the current from the alternator, the larger wire went to the starter with the TR muli-spade connector inline. The end result, though not original, sure as heck is sensible and sturdy. Spent a lot of time tidying up everything to where the wire routing looks professional. An aside, the higher amp alternator sure makes all my lights work better, plus all the other gizmos I have hanging off my system.

I know that TR indeed ran a Delco-brand alternator on some model Triumphs as original, not sure of the amperage though.