Triumphrat

jh1498 · 02-10-2008, 01:16 PM

I need to know what the ohms should be when testing the coils?

AKMCDM · 02-10-2008, 01:31 PM

I beleive it should be 10. Try testing them when they are hot to see if you have one going bad. When they are cold they may test ok. I am having the same problem with my 96 Adventurer iratic Tach when running also.
I am purchasing Nology coils.
Corey

jimmyj900 · 02-10-2008, 09:15 PM

The resistance on the primary side of the coil is 0.63 ohms and the manual gives a 10% tolerance.

The secondaries of the coils are difficult to measure since there's a pair of diodes in series with the winding and you need a volt/ohm meter that puts out greater than 1.5 volts when in ohms mode. Not many meters will do that.

The best test for the coils is to hang a spark plug off the coil high voltage lead, ground the big end to the chassis or engine case, and then crank the engine.

A fat blue spark says you're OK but a thin yellow (or no) spark says that either your ground to the spark plug is bad, the coil has failed or your battery voltage is low.

Jim