60hp. Merc dead ignition

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tcaptain

Recruit
Joined
Apr 16, 2002
Messages
3
I'm working on a 60hp Merc. Ser# OB342759 with no fire. Its a 88 to 90 model with the trigger under the flywheel with 3 wires going to the switchbox. I'm getting no readings from the trigger when cranking and no static ohm's readings between any leads. I sure hate to replace the trigger if its something else. Any ideas?
 
12Footer

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: 60hp. Merc dead ignition

If you get zero coninuity from the trigger leads, you have an open trigger winding..It sounds like you found the problem..Maybee. Rule-out the kill circuit and harness first. Disconect the kill wire at the engine,and see if you get fire.<br />The book states you can't check the trigger without using the fancy-schmancy merc thunderbolt ignition system analyzer (like everybody has one of these 500dollar tools, right?), but you should have some impedance across the windings of the trigger and stator.
 
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ODDD1

Lieutenant Junior Grade
Joined
Jan 23, 2001
Messages
1,054
Re: 60hp. Merc dead ignition

tcapt...you have 4 wires coming from the trigger....the 4th is marked WHT/BLK and is the 'common' for the other 3...test between the violet/white/brown and this wire for a ohms/crankin DVA check...
 
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tcaptain

Recruit
Joined
Apr 16, 2002
Messages
3
Re: 60hp. Merc dead ignition

OK, the trigger shows cranking continuity. The red lead from the stator shows a slight neg. reading, the blue lead shows 12 volts, and the blk/yellow lead shows 14 plus volts. nothing going out to the coils. Bad switchbox????
 
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petryshyn

Commander
Joined
Oct 3, 2001
Messages
2,851
Re: 60hp. Merc dead ignition

tcaptain<br /><br />Ya gotta do what oddd1 suggests. you're going to need a DVA adapter or peak reading meter. The voltages occur so quickly that a standard meter doesn't have time to register. I see 3 choices here:<br />1) Buy an adapter and check it thoroughly<br />2) Take it in to a mech.<br />3) Shoot blindly and replace parts<br /><br />just my .01 cents :)
 
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