Another reason why you need to keep your batteries on a trickle charger when not being operated frequently....BTDTMake sure starter RPM is not slow
Test your ignition coils.Hey guys if anyone can help me it would be greatly appreciated I have a 1996 mercury 150 2stroke black max offshore and I’m only getting spark in one cylinder replaced fuse and everything still not working serial number is 0G230698
Test it with a battery that turns over a car motor. Takes minutes to easily rule out.Some will argue.----Charge the battery.-----Have the battery load tested even if new.-----Take starter apart for inspection / ohm test on armature / possibly new brushes.----Not much money spent.-----I agree , low cranking speed leads to a " no spark " condition.