petronix tach lead?

[daved.]

OK, put in the new Petronix, works great. Problem is no clear tach lead to hook up to. Tach lead(s) used to attach at the now gone condenser spade. Made a new lead to go from the tach (two wire) lead (formerly attached to the condenser) to the second negative coil spade, right next to where the Petronix is now connected.

Problem is when new tach lead is connected the car won't start. If I unhook the connection between the tach lead(s) and the negative coil spade car will start and purr. So what gives?

'71 12 fuse.

Dave

[Beaner7102]

DON'T attach the condensor wires to the coil.

The tach wire is a single black wire that would have been attached to the negative side of the coil. Find it and hook it back up. Or if its missing, run a new wire from the coil (- side) to the back of the gauge pod - its the single black wire plugged in behind the tach. Beaner7102

[daved.]

There is a lead w/ two black wires leading back to the dash that had been connected to the condenser, I assume this is the tach wire. Now, w/ condenser gone there is no male spade to connect this(these) to. I ran a wire from the negative side of the coil to them, engine would not start.

Waiting to call petronix, living w/o a tach.

[daved.]

There are indeed two leads to the condenser. One is grounded out to either a remote tach or back to the positive side of the coil. Either way to get the tach to work I needed to cut the second wire and leave only the lead going directly to the dash tach. Finito.