Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Wiring diagram?

A crap mechanic asks:

Is there a wiring diagram anywhere for the M3W?

I am trying to fit a replacement rectifier and I need to know where to attach the long cable from it. The coil seems the most obvious answer but it's all very fiddly around there and I want to avoid daft mistakes if possible.

It goes to B+. That is the large terminal with the red base just under the edge of the cowl behind the engine.

Lot simpler to cut the "long wire" and install a weatherproof plug so you can switch out the old rectifier and put in the backup. BTW that wire is always HOT even with the key off so take care.

Sentence 2, no problem: I am paranoid about electrical stuff so always disconnect the battery before trying anything clever, or even something stupid.

Sentence 1: can you give a bit more detail on that? I have all manner of things for cutting the long wire, but what about this weatherproof plug? To be installed where? To plug into what?

I would really appreciate a step by step connect this to that type post regards the rectifier. Mine is ok at the moment, but it seems such a showstopper I would prefer to understand the needful before it happens

Hear! Hear!

Doubly so, because for me it has happened.

When faced with a dead regulator, I had no clue where the "long" wire went. After some judicious tugging, I discovered it went the B+ post. Problem one was that it was nicely incorporated into the wiring harness at the factory and you could not pull it back from the regulator end due to the large terminal lug on the end. With the battery disconnected, I clipped the end off and pulled it out of the harness. The rest was not too bad. I mounted the regulator and fussed around with the connections making sure they were secure and Ty wrapped as close to what the factory had done as possible. I then encased the long lead in a length of split wrap and laid it in along side the existing harness. I attached it to the B+ post and the Ty wrapped it to the harness for support. This all happened at 1,400 miles and I now have 5,600 miles on it. The only side effect is that I know always drive with voltmeter selected...:)

I am faced with two problems:

1) I am not convinced that the "long wire" on my replacement regulator is long enough.

2) Its ring at the B+ post end is smaller than the original and will not fit over the thread.

Er, where am I? What next?

Ok, I carry a spare regulator of the Harley variety. In order to make it useful, I replaced the original ring with one that fit over the post. You need a ring, wire strippers, shrink tubing and a soldering iron (or crimpers). That will take care of 1.
As for 2, place the regulator in approximately the installed position and lay the long wire into position and see if it reaches. If it does, fine. If it doesn't, use some of the existing wire from the old unit to extend it. This could be done in a way that uses the old ring. Again, wire strippers, shrink tube and solder would be needed.

Thanks rolsmith.

I have solved problem 1 - the wire is long enough (just!). With your helpful advice I should now be able to crack problem 2.