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1993 thunderbolt 4

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marinetech2008

New member
I'm trouble shooting no spark on a 93 Thunderbolt 4 motor and I was wondering with the key on the coil has power on both the positive and negative side is that normal if not what would cause that Thanks!!!!
 
Tests for Thunderbolt Ignition:


Tests for Thunderbolt Ignition:
W/ignition key on AND BILGE WELL VENTILATED OF GAS FUMES!!!

#1 - Connect your voltmeter neg. lead to the engine ground and pos. lead to the white/red wire terminal at the dist. It should read 12 volts.

#2 - If 12 volts is present remove the coil wire from the distributor cap and connect it to a spark gap tester to ground.

Remove the white/green lead from the dist. terminal. Turn the ign. key to on and strike the white/green lead to ground. If there is spark, replace the ignition sensor in the dist.

#3 - If there is no spark, substitute a new coil and repeat test

#2. Now if you get spark, install a new coil. NO SPARK, replace ign. amp.

#4 - In #2, if there is No voltage present, disconnect the white/red wire and check it again for 12 volts. If 12 volts is present, replace the ignition sensor inside the dist. cap. If no 12 volts present w/it disconnected--ignition amplifier is shot and must be replaced.
 
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