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distributor coil connection to cap

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glenn carpenter

11-12-2023 18:21:36

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tab on bottom of coil that makes contact with stud at top of cap that goes down to rotor, how does this work? Does power travel down this to the rotor? If so, where does it come from?

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Mad Farmer

11-15-2023 10:38:50

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Re: distributor coil connection to cap in reply to glenn carpenter, 11-12-2023 18:21:36

Quote: glenn carpenter (quoted from post at 19:21:36 11/12/23) tab on bottom of coil that makes contact with stud at top of cap that goes down to rotor, how does this work? Does power travel down this to the rotor? If so, where does it come from?

What Bruce said.

When the primary circuit/points are closed current flows through the primary coil windings, the 2ndary circuit charges making a magnetic field.

When the points open the 2ndary field collapses, inducing a high voltage in the 2ndary. This is transferred via coil to cap/rotor/plug wire/spark plug.
This post was edited by Mad Farmer on 11/15/2023 at 10:43 am.

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Tim PloughNman Daley

11-15-2023 06:07:51

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Re: distributor coil connection to cap in reply to glenn carpenter, 11-12-2023 18:21:36

Bruce has it explained. Power is supplied by the battery voltage. Camshaft on engine rotates the distributor. Cam & Weights which also rotates and rotor contact is made to the coil tab each time as each cylinder is fired. Maybe this will help further clarify function and operation.

FORD FRONT MOUNT DISTRIBUTOR 6V COIL & TEST:

IF PIGTAIL CONNECTOR ON COIL DOESN'T MAKE CONATCT WITH THE SPECIAL HEAD BRASS SCREW ON THE CONDENSER WIRE, (SEE 'A' 'B' & 'C') NO CIRCUIT CAN BE MADE.

6V COIL STATIC TEST:

NOTE: TEST DOES NOT CONFIRM COIL IS GOOD. A 6V COIL SHOULD READ ABOUT 1.5 OHMS; FOR A 12V COIL DOUBLE THAT.

Tim Daley(MI)

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Bruce (VA)

11-12-2023 19:17:25

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Re: distributor coil connection to cap in reply to glenn carpenter, 11-12-2023 18:21:36

The coil has 2 circuits, primary and secondary. Primary circuit carries battery voltage through the stud, pig tail, brass screw then to the points. Secondary circuit is from the stud, to the tab to the cap, rotor and spark plugs. When the points open, you get 24k or so volts in the secondary circuit.

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