We have a BlackMagic flex-a-lite installed on our stang. The wiring instructions tells you to hook it up to the ignition. We have the same problem when the fan is on and you crank the motor - it's obvious straining the ole amp juice.
Even if you wire it directly to the battery with a relay - you'll still have the same problem if you shutdown for a few minutes and you've got the same cranking issue.
I'm thinking about hooking up a relay with a switch on the console that will kill the fan until you're cranked up..
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