If that reading is accurate, it would definitely affect primary current which
would then affect secondary voltage. It sounds like you have a 12 volt coil
with an internal resistor. I think the 24 volt coil on my 5 ton truck is really
just a standard 12 volt coil that is normally used with an external resistor.
(Or a bad coil?) The primary resistance is in the 2-4 ohm range also. But
there is a large resistor built into the distributor with a heat sink that hangs
below the rotor housing that reduces the current through the windings so when
the points are closed so the coil doesn't burn up. It is important that enough
current flow through the primary coil to saturate the windings with magnetic
flux. If not enought current flows, the coil will not saturate and the
secondary HV output will be reduced.
Dave
John Bowen wrote:
> I'm curious whether anyone has had any bad experiences with the 24V
> aftermarket coils currently available. They have a metal case and are, I
> assume, an import.
>
> I have checked two for low scale primary resistance and they measure 13.2
> versus 4.26 - 4.9 the maintenance manuals specify. I don't know whether
> that materially effects performance but I am having a problem with a truck
> running for about 6 minutes then shutting down. After an extended period it
> can be restarted, albeit a hard start. Pyroil starting fluid has been used
> during cranking with no apparent effect so this appears to be a weak spark
> problem (all other components in the distributor have also been replaced and
> voltage to the distributor checked.)
>
> J. D. Bowen
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This archive was generated by hypermail 2b29 : Mon Aug 07 2000 - 22:16:02 PDT