Re: Resistance?

Posted by Bob M on September 09, 2004 at 10:31:13 from (165.170.128.66):

In Reply to: Resistance? posted by Phil from Maryland on September 09, 2004 at 07:32:04:

Phil - Ballast resistor resistance varies somewhat with temperature. I figure anything between about 2.5 and 4 ohms means the resistor is OK. A reading greater than 4 ohms - especially when cold - would make the resistor suspect.

Quick way to tell if the resistor is working? It should get too hot to touch after running several minutes. If it remains cold it's shorted. (Also a shorted resistor causes the coil to heat up and the points to burn out quickly)

Another test is with the engine stopped, the points closed and the ignition switch on you should read about 6 volts across the resistor and 6 volts across the coil primary.

It's tough assess the condition of a coil with a multimeter. Depending on the coil the primary should read between about 2 and 4 ohms, and secondary between 1,000 and 5,000 ohms. But a coil can show acceptable resistance readings and still develop a weak or no spark. Better approach is to swap it with a known good coil.

Follow Ups:

• Re: Resistance? Stan(VA). 20:30:44 09/09/04 (0)

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