Mercruiser 4.3 Crank But no Start (spark issue)
Hi everyone, new to boat life and new to the forum. I recently bought a 1990 (old I know, but in great shape) maxum 2100 with a mercruiser 4.3. First few days of having the boat it started right up never an issue. One day I forgot to turn off the radio when covering the boat (it was raining really hard) and it drained the battery. Was anticipating it to be a simple battery swap but that was not the case.
Battery was replaced, then bolts on starter snapped. I ordered and replaced the starter. I have also replaced the solenoid, ignition coil, distributor cap and rotor, spark plugs and spark wires with no luck. When I check the spark at the distributor, I get one initial really strong blue spark when cranking. After the initial spark, there are no more sparks until I reset and recrank.
From reading around the forums like a mad man, I came to the conclusion the problem could either be a bad ignition module, possibly a shift interrupter? Perhaps something else I am overlooking?
All 4 wires that come off the thunderbolt IV ignition module have power which go to the coil. Purple is good, grey is good, white with red stripe is good. Getting very low readings on the white with green stripe. Pretty sure this wire controls the feed being sent to the coil in order to generate sparks in the distributor.
Any help would be greatly appreciated as I am ready to bring it to a local marina and call it quits. Money is not the issue and have no problem bringing it to a professional. I just wanted to sort the issue myself so I am knowledgeable about my older boat and know how to service and maintain it myself
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