"i have two 150 merc outboard
"i have two 150 merc outboard on my boat, engine A starts fine, when you try to start engine B, engine A revs up. wiring is correct, new isolator, no map sensor, new tps, did compression test, spark test, ohms reading is good on coils. i have been troubleshooting these engines for the past 2 weeks, i am running out of ideas. please help!!!"
"i have two 150 merc outboard on my boat, engine A starts fine, when you try to start engine B, engine A revs up. wiring is correct, new isolator, no map sensor, new tps, did compression test, spark test, ohms reading is good on coils. i have been troubleshooting these engines for the past 2 weeks, i am running out of ideas. please help!!!"