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Old 01-11-2009, 06:31 PM
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coil specs SB 350

I have a 1990 Suburban w/ a sb 350. I need the ohm specs so I can test it. Does anyone know them?

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Old 01-24-2009, 12:13 AM
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the low voltage side wil be under 10 ohms the hi voltage around 2000 ohms

coils seldom go bad my buddies model A has its origional coil

the coil failures generally involve carbon tracks or cracks on the high voltage terminal

you will probably get the same ohm reading on a bad coil

a better method of testing would be to put a spark plug on the hv terminal and touch 12v to the low voltage terminal if you get a spark its probably a good coil

most of these new cars have resistor "wires"
these are a piece of string rubbed with graphite
after a year or so tend to be a lot more than the approx 1000 ohm reading you get with new ones

the insulation over the wire also deteriorates

so at night in a dark place have a buddy turn it over while you look at the wires. if you see blue flashes on all the wires replace them.

when my Toyota has trouble starting on a rainy day I replace the ignition wires, fixes it every time, $15 every other year or so.

Last edited by PeteTy; 01-24-2009 at 12:19 AM.
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