spark plug wire, hei module ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nevada70chev · 07-09-2003, 02:51 AM

how can you test a plug wire to see if it is good or not? is there a way to test the module in the hei without putting it in the motor? thanks

JimKshortstep4x4 · 07-09-2003, 06:39 AM

Testing spark plug wires is easily done with an ohm meter. resistance will vary, but comparing readings to other wires in the set works. Any reading approaching infinity indicates a bad wire.
This test does not work for cracks or defects in the insulation if for example, a plug wire spark jumps to ground.

An ohm meter can also be used on testing the module. I usually compare to known good module values. This is not a conclusive test but works in most cases. The other method that I use is to spin up a test distributor in my distributor machine. That is the best way that I know of testing a module.

Jim

07-09-2003, 02:51 AM	#1
nevada70chev Registered User Join Date: Jul 2001 Location: reno, nv Posts: 646	spark plug wire, hei module ?'s how can you test a plug wire to see if it is good or not? is there a way to test the module in the hei without putting it in the motor? thanks __________________ 70 LWB, 350/350 A/C, P/S, 3 Tone Paint (white cap, primer gray with black guide coat)

07-09-2003, 06:39 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Testing spark plug wires is easily done with an ohm meter. resistance will vary, but comparing readings to other wires in the set works. Any reading approaching infinity indicates a bad wire. This test does not work for cracks or defects in the insulation if for example, a plug wire spark jumps to ground. An ohm meter can also be used on testing the module. I usually compare to known good module values. This is not a conclusive test but works in most cases. The other method that I use is to spin up a test distributor in my distributor machine. That is the best way that I know of testing a module. Jim



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