Alternator Exciter Wire

[Mertin]

Is there any small crimps that can be utilised in place of the standard plug? I suspect a dodgy connection within the plug as when adjusting it I could hear the engine go under load when alternator did start charging but couldnt get it to maintain a charge.
I have a spare loom but would rather not butcher it, and also the plug doesnt latch on the alternator so would prefer something that I knew wasnt going to come loose

 

[bloke]

just buy a new plug.