Hi Thomas,
I think you should identify the cause of the problem rather than creating a 'band-aid' fix, because it could mask the root cause, which may be an electrical ground problem, or a high resistance somewhere in the ignition circuit.
You have said that the input voltage at the coil is 9.5V after the fans come on, but what is it before the fans come on?
What is the voltage across the battery terminals when the fans are on?
With the fans off, and then on, what is the voltage drop between the battery positive terminal and the input to the ballast resistor from the ignition switch? (put the voltmeter positive lead on the battery positive terminal, and the negative meter lead on the ballast resistor input)
Regards,
Kevin
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