The Dodge Challenger Message Board

So.... I had my wife pull the coil out of her chally in December,...as I needed it in a Chebby...
I put it back today,...but I was in a bit of a hurry,...so I forgot to connect the negative side of the coil,. to the points...thus only + and Tach(-) was connected....
Obviously the car didn't start.....
After som head scratching, I found out...connected the (-) also,...the car runs great,..but now tach don't work....
Any suggestions as to what happened,...and how to remedy the situation ?


Also,...why why why, when I type,... all of a sudden the cursor jups the middle of else somewhere to ????

To put it simple. When you cranked the engine you basically connected the tach across the battery.

When cranking you have full battery voltage across the coil.

The -ve of the coil earths through the points. Without the points in circuit you earthed the coil through the tach.

So I am guessing the tach burnt out.

Grrr.
I good sunligth, I found that what I thougth was the tach cable,...was the cable I used for running a shiftligth..some years ago.....
I connected the cable for the tach,..and now it works....

Some more details on the tach signal.
On the Baracuda, (The other car...)...I'm running a Tach adapter.
The GearVendor Auto Shift Sequencer needs the tach signal,...so I borrowed it from under the dash....
I was surprised to "feel" the voltage going in to the tach......I was expecting 12V,...but surely I wold not be ble to feel a small el-shock from only 12 V?
I felt the shock when I put the ignition "ON"...
Just for info; The tach on the Barracuda is working,...but I'm yet to test the ASS.

That was a bit of luck.

Yeah you can feel 12 volts as long as you can get it to flow. It will put 100 amps into you if you were a strong enough dead short.

Actually. Might it have been a bit of back emf from the coil somehow?