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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16209
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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mercury outboard mercury outboard 50 hp... ~1983

Resolved Question:

mercury outboard 50 hp... ~1983
Submitted: 6 years ago.
Category: Boat
Expert:  Jason replied 6 years ago.

Hello, and welcome to Justanswer. My name is XXXXX XXXXX I will be helping you today. If you need clarification on something please post back here.


Hi there,

Mercury used quite a few different stators in those years, but here are resistance checks that you can perform with your multimeter. If you have a DVA adaptor for your multimeter, you should also take voltage tests, as this is the best way to check it.


1. Flywheel with magnets glued in

Blue to Blue/white - 3250-3650 ohms - 100+ volts when cranking

Red to Red/white 75-90 Ohms - 25+ volts


2. Flywheel with magnets bolted in

Blue to blue/white - 5000-7000 ohms - 100+ volts

Red to Red/white - 125-155 ohms - 25+ volts


3. Red stator

White/green to green/white - 500-700 ohms - 100+ volts

Blue to blue - OPEN no resistance 0 100+ volts

Blue (each) to ground - Same as above


If your stator fails any of those tests above it is no good.

Also check your flywheel for broken magnets.

Post back with questions.



Jason and other Boat Specialists are ready to help you
Customer: replied 6 years ago.
what if stator is good?
Expert:  Jason replied 6 years ago.

Then you would be looking at a bad switchbox/powerpack,(same thing, different folks call it different items) Or, multiple dead triggers on the timer base.

The switchbox would be the most common items. It is not common to have multiple triggers die all at the same time.

Customer: replied 6 years ago.
Could it be a swithbox or trigger?
Customer: replied 6 years ago.
how do you ck a switchbox?
Expert:  Jason replied 6 years ago.

Switch box's by themselves are not directly testable. To test them, what we check first is voltage input to the switchbox from both the stator and the triggers, then we test voltage out of the switchbox to the coils. If all of the voltages in are good, but the voltages out of the switchbox to the coils is bad, we can deduct that the switchbox is bad.

To test voltages, the only way to do it is with a multimeter with a DVA adaptor.