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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG TD TF 1500 - Brake Light Switch Wires

I am adding a turn signal harness to the TD. The original harness provides green and green/white wires for the brake light switch. The add on harness provides green and green/purple wires for the switch. I seems to me that only the second set of wires needs to be connected to the switch, and the first set is now redundant. Am I correct? If so, what to do with the first two?


Bill
Bill Reid TD4618

Didn’t you get directions with your add on harness?
W A Chasser

Original circuit would complete ground directly to the bulbs. With the new wiring, I think the switch would complete circuit to the relay box, which then would go to the lights. Compare early/late wiring diagrams. George
George Butz III

Directions....sort of. A diagram of the DB-10 with the different colored wires coming off of it. It doesn’t address the original brake switch wires.
Bill Reid TD4618

Green to power, green/purple goes to relay box, 14/15 go to the rear bulbs. Disconnect the current wires, make sure it works and tape them off.

George Butz III

Thanks, George!
Bill Reid TD4618

This thread was discussed between 08/12/2020 and 09/12/2020

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