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Mercruiser Circuit Breaker Test

ehlien

ehlien

Regular Contributor
I'm trying to debug a non functioning ignition system. So far I have traced the lack of spark to the mercathode area on my 1994 454 . I just replaced a blown in line 20A fuse in the feed line from the positive battery terminal to the + terminal on the merctathode but now notice the 50A circuit breaker located below the mercathode appears to be stuck all the way out and will not move or depress. How can I tell or test to tell if the circuit breaker is working or bad??
 
I will put an ohm meter on it today but, should the button depress freely or not? It seems to be frozen. Boats .."Its always something" And BTW curious ..what would be the probable causes that would trip the breaker?
 
By non functioning ignition system I mean I'm not getting any spark at the plugs. I used an ohm meter today to confirm the circuit breaker had a closed circuit so I assume that's ok so tomorrow its on to see if the coil is getting power and if the coil is good.
BTW I'm also trying to figure out why none of my gauges are working and if that problem is related. Everything worked fine 2 years ago when I put the boat away for the winter so not sure how there could be a major change to the system.
 
DUH!!! Maybe ... can't remember off hand (but probably forgot to replace it after last removed) ....I will have to check tomorrow..if so that will be pretty embarrassing!! Thanks for the slap up side the head though ...lets hope its that simple........................
 
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