Coils and spark

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Model T Ford Forum: Forum 2015: Coils and spark
Top of pagePrevious messageNext messageBottom of page Link to this message  By harold lee cartwright on Wednesday, June 17, 2015 - 11:44 am:

just changed battery cables to 2/0 wire and what a difference on starter rpm now I lost spark should all 4 coils buzz at the same time I have power at #1 coil but none elsewhere


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange - Hillsboro, MO on Wednesday, June 17, 2015 - 11:56 am:

With the key on battery, only the coil whose primary circuit is being grounded by its timer segment will buzz.

With the fuel shut off, the car in neutral, the wheels chocked and the key switched to battery, pull the engine slowly through two full revolutions, the coils should fire one at a time in sequence 1 2 4 3.

Make sure the yellow harness wire is attached to the battery side of the starter switch, per this diagram:

wiring


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Wednesday, June 17, 2015 - 11:58 am:

Question one: Did the car run before you changed the cables? Your post is vague on the coil problem.


Top of pagePrevious messageNext messageBottom of page Link to this message  By harold lee cartwright on Wednesday, June 17, 2015 - 12:04 pm:

car did run starter was slow so looked at cables and saw they were 4 ga changed out


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Wednesday, June 17, 2015 - 12:36 pm:

OK. You probably changed something else besides the cables. Did you move any other wiring? You say all 4 coils buzz at once. A pretty hard thing to do actually unless all 4 were grounded for some reason. (They always have pos. power wether on batt or mag). Like a massive short in the timer/timer wiring set-up. You altered something besides changing the cables.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ron Patterson-Nicholasville, Kentucky on Wednesday, June 17, 2015 - 04:20 pm:

Notice the correct gauge of the battery cables on this wiring diagram for the Model T.
2
Ron the Coilman


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