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Old 10-02-2019, 04:31 PM   #1
39portlander
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Default Bench testing coils....

I have the funprojects CT-2 coil beeper and have about a dozen good coils according to the tester.

Is there an easy way to put four coils in the box and apply voltage to check buzzing and spark with plugs in a spare head on the work bench before I get things built and mounted in the engine compartment? Any input would be great.
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Old 10-03-2019, 01:28 AM   #2
redmodelt
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Default Re: Bench testing coils....

The tester is only going to tell you that the windings are good. They need to be setup for proper am draw (1.2 to 1.4 amps).

http://www.mtfca.com/discus/messages...tml?1515186907
http://www.mtfca.com/discus/messages...tml?1364507902
http://www.mtfca.com/discus/messages...tml?1356970583
Having good working coils is a little more involved then just having good windings.
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Old 10-03-2019, 05:14 AM   #3
39portlander
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Default Re: Bench testing coils....

Thanks for the MTFCA links. Let me rephrase the question, with four proper amp draw coils in the box is there a way to power the coils and the spark tested?
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Old 10-03-2019, 08:54 AM   #4
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Default Re: Bench testing coils....

You can recreate the system function. You will need a switch to act as a timer and some jumpers to interconnect the circuit. Something to act as a ground plane or a common jumper so you can ground the spark plugs & circuit would be needed. A high tension wire for the spark plug and a battery to power it up to round off the items needed. A car battery or possibly a lantern battery could be used. 12-volt would likely work better. Insulate the high tension well. You don't need a bite from that.
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Old 10-03-2019, 11:26 AM   #5
redmodelt
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Default Re: Bench testing coils....

I think in one of the links I posted there is a diagram how to test using a spark plug, not the one with the bent wire. Each time the roller or brush passed over a segment in the timer it closes the circuit to ground. Connect the + to the terminal and - lead to the head, connect the wires to the plug(s), use a jumper a wire to any of the timer terminals to ether the head (ground) or plug base if not mounted in head. By moving the jumper wire from terminal to terminal you can check each plug/coil. The coil box is not the ground as the coils are isolated from it.
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Old 10-03-2019, 05:59 PM   #6
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Default Re: Bench testing coils....

This is what I got set up on the bench @ the moment, thanks for the input on wiring this to check operation.

Still saving up for a Bergs radiator so thought this could keep me busy while waiting and if it works, knowing it makes sparks
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Old 10-04-2019, 01:08 AM   #7
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Default Re: Bench testing coils....

Put the plug wires on the bottom terminals. The top ones go to the timer. Looks good.
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Old 10-04-2019, 05:53 AM   #8
39portlander
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Default Re: Bench testing coils....

Quote:
Originally Posted by redmodelt View Post
Put the plug wires on the bottom terminals. The top ones go to the timer. Looks good.
Yes good eye there Red, I just put those on the box for the pic. Again the MTFCA links and more reading in the electrical systems guide has helped with understanding this system.

I think hooking a wire from a battery + through a small toggle to the bottom box contact and the four ends of the commutator wires from the box through four individual small toggles to (-) replicating the rollers function in the timer it will work.
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Old 10-04-2019, 04:19 PM   #9
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Default Re: Bench testing coils....

When I posted the photo I did not see how it was wired. Removed photo to avoid confusion.

Last edited by redmodelt; 10-05-2019 at 12:58 AM.
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Old 10-17-2019, 08:22 AM   #10
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Default Re: Bench testing coils....

no picture
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