This post on behalf of a member who doesn't do internet.
He has an early positive earth 2000 and wants to fit the tacho and clock pod from a TC. Seems to me there are two approaches - change the car to negative earth or change the tacho wiring to suit the car.
My recollection is that changing to negative earth can be a bit fraught thanks to the dynamo and control box. I seem to remember it's necessary to "flash" the dynamo to get rid of residual field magnetism from the positive earth? Can anyone put some flesh on this and/or provide a procedure to change to negative earth?
Modifying the tacho witring to suit positive earth sounds fraught as well! Clearly no problem with the instrument bulbs or clock. The two other circuits are the power supply to the tacho and the signal cable to the coil. The power supply is taken from the 10V voltage stabiliser at the rear of the speedo. Also the wire to the coil I know likes to be on the right side of the coil. Will it all work simply by swapping the coil wire to the positive terminal (it normally lives on negative) so that it matches the swap on the power supply?
He has an early positive earth 2000 and wants to fit the tacho and clock pod from a TC. Seems to me there are two approaches - change the car to negative earth or change the tacho wiring to suit the car.
My recollection is that changing to negative earth can be a bit fraught thanks to the dynamo and control box. I seem to remember it's necessary to "flash" the dynamo to get rid of residual field magnetism from the positive earth? Can anyone put some flesh on this and/or provide a procedure to change to negative earth?
Modifying the tacho witring to suit positive earth sounds fraught as well! Clearly no problem with the instrument bulbs or clock. The two other circuits are the power supply to the tacho and the signal cable to the coil. The power supply is taken from the 10V voltage stabiliser at the rear of the speedo. Also the wire to the coil I know likes to be on the right side of the coil. Will it all work simply by swapping the coil wire to the positive terminal (it normally lives on negative) so that it matches the swap on the power supply?