My 1966 BSA Bantam D7 Super Restoration



Wiring Connections

The following is an explanation of the Light Switch and Ignition Switch contact status i.e. "closed contacts" when the switches are in their various positions.  Firstly disconnect the switch from its base and look at the switch from the underside (with the male terminals facing you)  and the "gap" between two of the contacts at the six o'clock position.  Then imagine that the male terminals are numbered 1 to 9 from the first on the left of the "gap" with the numbers going in a clockwise direction.  Both switches have links soldered into the bases which they plug into and the links differ in each example.

Light Switch.

OFF.  The following are "made" terminals 1 and 2, 5 and 6, 8 and 9.

L.  The following are "made" terminals 1 and 2, 4  and 5, 7 and 8.

H.  The following are "made" terminals 2 and 3, 2 and 9 and 3 and 9, 6 and 7.  

Ignition Switch.

OFF.  The following are "made" terminals 1 and 2, 5 and 6 and 8 and 9.

I.  The following are "made" terminals 2 and 3, 2 and 9, 3 and 9 and 6 and 7.

E.  The following are "made" terminals 1 and 2, 4 and 5 and 7 and 8.


The following is the wiring diagram for a replacement Solid Sate Rectifier. 

The one I fitted was a MCA Stock number R56. 

MCA contact details are 38-50 Victoria Road, Aston, Birmingham. B6 5HF. 

Telephone 01215545644 OR 01215543011 

Top left and bottom right are the alternator connections, top right is the supply out and bottom left is the positive earth.

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