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Old 11 July 2014, 07:57   #1
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Fuse/circuit breaker on main battery wire

Hi

I'm currently trying to diagnose a starting problem with our engine and one of the things I'm not sure of is should there be a circuit breaker/fuse on the main battery wire to the engine?

I currently have a 60A circuit breaker on both the main and aux battery wires but on occasion the breaker on the main battery wire trips when I try and start the engine. I'm not sure if I need a higher rated breaker or whether this might be a problem with the starter motor?

Any thoughts or ideas welcomed.

Cheers
Rob
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Old 11 July 2014, 15:55   #2
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I never had a fuse on the he main battery wire to the engine, but maybe someone has, don't know. I guess starter typically uses much more than 60 amps so no wonder if some issues?

I do have main circuit breakers on engine wire but typically they are rated for short bursts like 500-1000 amps, blue sea sytems is an ok brand for that purpose.
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Old 11 July 2014, 16:05   #3
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A starter motor can draw in excess of 330a therefore it is inadvisable to have an in-line circuit breaker unless it is high current rated.
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Old 11 July 2014, 16:08   #4
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Hi

I'm currently trying to diagnose a starting problem with our engine
Would that be an Etec 150 by any chance?
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Old 11 July 2014, 17:40   #5
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Would that be an Etec 150 by any chance?
Nope but close it's predecessor the ficht 150. Sounds like you may have experience of a similar problem?
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Old 11 July 2014, 18:34   #6
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I'll give you a better answer tomorrow, rule #1 is in force at the mo.
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Old 12 July 2014, 03:33   #7
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Hi,

Circuit breaker 60 amp that is your problem. Like posted earlier the starter motor draws a lot of current way in excess of 60 amp. I have the same motor and I have always gone direct to the solenoid.
When I had a problem everything was dead apart from the trim on the engine, turned out to be a broken wire in the harness to the helm.
Fantastic engine has given brilliant service.

Good luck.
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Old 12 July 2014, 04:26   #8
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Nope but close it's predecessor the ficht 150. Sounds like you may have experience of a similar problem?
I had a 175 ficht on my previous boat, but didn't have any problems. As the others have said, lose the breakers, both in the main starter line & the auxiliary charging line from the motor, I'm assuming you have the dual charging harness fitted. Anything that reduces the voltage to the engine when it's trying to start will screw with the EMM electronics & cause problems. Anything that can connect or dis-connect a battery to the engine whilst it's running is a charging circuit killer. Neither of your breakers are necessary & are failure points.
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Old 12 July 2014, 09:31   #9
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Thanks for the replies guys, going to remove the breakers tomorrow and see how it behaves.

I have a feeling I may have a starter motor problem as well but we'll see once the breakers are out of the way. Everything is fused through the fuse box anyway so no breakers shouldn't cause any other issues.

Cheers
Rob
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Old 13 July 2014, 14:12   #10
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Well breaker removed and engine started first try and every try thereafter.

However now on to the next problem, the engine is lumpy and surges at tick over and there is a misfire. Time for another thread about this
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