Ignition Control to Distributor
its an AC signal.
the current flows for a short period in both directions in both wires. it crosses 0V (not flowing in either direction) in the middle of its wave form and at some small voltage above 0v in the positive direction it triggers the igntion module. the picture below shows why getting those two wires the wrong way round can cause timing drift. it should trigger off the upswing above 0v not on the down swing below 0v
This is the reason for the mopar specific male/female dual bullet connector, stops you getting this part back to front.
its not an on off or 0, 1 type digital signal on a single wire that can be measured above the modules case ground, as you get on some modern instrumentation or devices. or just a voltage above ground like out the back of an AF guage (both assume 0V is case ground) The coil in the dizzy is held at what the module thinks is ground, and the movement of the iron reluctor star on the distributer armature, past a magnetic pole, with a coil around it connected to both wires, causes a current to swing south of 0v and then north of it triggering the module to switch off the coil....
its very very analogue. :)
Dave
its an AC signal.
the current flows for a short period in both directions in both wires. it crosses 0V (not flowing in either direction) in the middle of its wave form and at some small voltage above 0v in the positive direction it triggers the igntion module. the picture below shows why getting those two wires the wrong way round can cause timing drift. it should trigger off the upswing above 0v not on the down swing below 0v
This is the reason for the mopar specific male/female dual bullet connector, stops you getting this part back to front.
its not an on off or 0, 1 type digital signal on a single wire that can be measured above the modules case ground, as you get on some modern instrumentation or devices. or just a voltage above ground like out the back of an AF guage (both assume 0V is case ground) The coil in the dizzy is held at what the module thinks is ground, and the movement of the iron reluctor star on the distributer armature, past a magnetic pole, with a coil around it connected to both wires, causes a current to swing south of 0v and then north of it triggering the module to switch off the coil....
its very very analogue. :)
Dave