SMTCapeCod

OK, I have gotten some guidance that the distributor pick up wire on my CIS car runs the positive signal through the outside wire shielding and that the inner core is negative. I don't read electrical schematics well, but the diagram seems to me to bear this out.

It puzzles me though, since I've seen so many with exposed outer shielding, and I would think that running the positive charge on the outside would raise the risk of inducing a signal through the ground wire if any cracks occurred in the insulation.

Can anyone tell me for sure which is pos/neg to assuage my fears about getting it wrong?
Thanks

Rich9928p

The distributor pick-up is a Hall Effect sensor.

see http://en.wikipedia.org/wiki/Hall_effect

The output of the Hall sensor signal goes to the transistor ignition box via the center cable. The output line is shielded externally - and this shielding is grounded to the same circuit as the ground side of the Hall sensor.

The output of the sensor

SMTCapeCod

OK, thanks. one is '7' and one is 31d' on the schematics I think. I'll try to sort which is ground.