Logo
FULL SITE MENU

No Spark

B

BrianDY

New member
Need advice:put new head gasket on Mercruiser 350 260hp (1995). Replaced plugs, wires, sensor assembly in distributor. Had it running great for an hour, and then it died. Checked all grounds, 12V to coil, nothing after coil. No spark. Motor has Thunderbolt IV breakerless electronic timing ignition. Any ideas why I don't have spark? Could it be the ignition?
 
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 distributor.

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

#2. Now if you get spark, install a new coil. (internal resister 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 distributor cap. If no 12 volts present with it disconnected, then ignition timing module (amplifier) is shot and must be replaced.
 
Back
Top