Originally Posted by Prestigeworldwideee (Post 4849091)

Okay, located the purple wire and it has no power with the key turned. There’s not much space to work with underneath.

Originally Posted by SB (Post 4849102)

Just for quick test to make sure ignition switch is bad, hook purple to the battery terminal (b or batt) keeping the wire hooked to it, still hooked to it and start motor. If it runs, you have bad ignition switch, which it seems like due to your checking switch positions with multimeter.

Note: engine won’t shut off with purple wire hooked to battery power. You’ll have to unhook purple from it to kill the engine.

i have a 12-14 gauge wire with alligator clips to jump terminals for such things. Makes it fadter to diagnose, especially in cramped quarters.

Originally Posted by SB (Post 4849110)

Key in run position.

check for voltage on white wire w/red stripe wire going into back of distributor. What do you get for voltage reading ?

Originally Posted by Prestigeworldwideee (Post 4849117)

I’m getting like 1volt

Originally Posted by SB (Post 4849119)

Hmmm.
I know flowchart says 1-12volts, but i think it should be at 12 volts.

can you take white/red off back off dist an check that wire lead again without it touching dist term or anything but your multimeter ? Be careful with the nut - they are small and easy to drop.

Originally Posted by SB (Post 4849122)

Quick question - you have a 1990 boat. In 88 and 89 many boats had a magnum 454 with alpha drive. Any chance your boat the same ?