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New Alternator wiring connections query.

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19K views 5 replies 4 participants last post by  Alfajay  
#1 ·
I have just received a new Alternator for my 1988 Quad from Classic Alfa in the UK.
The original alternator (see pic 1) Has the red positive wire connected to the "B+" terminal and the green wire connected to the "D+. There is no "W" terminal
terminal. This is correct per the service manual wiring diagram.The black capacitor is connected to the + terminal.
Picture 1
Image

Picture 2
Image

Now look at picture 2, the new alternator. Out of the box the capacitor is connected to the "D+" terminal and there is no "+" terminal but there is the "W" terminal which I think is a tachometer connection for a diesel engined vehicle.
I know I have to connect the green wire to the "D+" terminal. Should I also connect the capacitor to the "D+" terminal?
I know the capacitor is only there to cut down RF transmissions from the alternator so I could just remove it as I never listen to radio stations in the car any more.
Thoughts guys?
 
Discussion starter · #5 ·
Back in the UK we call the capacitor a "suppressor" to "suppress" RF interference. (A big problem in AM car radio days). I can remember installing many of them on generators and alternators and yes the capacitor was bolted to the alternator case as a ground and the wire was connected to the power out "B+" stud.
I have just checked and the "+" terminal on the original alternator is connected to the "B+" terminal. So the capacitor is connected to ground and "B+" . As the new alternator does not have a "+" terminal it would seem that all I need to do is crimp a ring terminal on the capacitor lead and connect it to "B+". With the green wire going to "D+" and the red positive going to "B+" this copies the original alternator connections. I have absolutely have no idea what the unmarked insulated stud on the new alternator is for. It does not connect to ground or to "B+", "D+" or "W".
 
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