Search Results for 'engine mounted circuit breaker'

[john]

Yes the pump is mounted foreword with those hoses you see. that picture doesn’t really show the whole mess. foreword they looped up the excess for the engine harnesses. more wiring and a marine stereo box also.  Just a joy to work on.

Kinda getting somewhere it seems. The power for the start circuit comes from a breaker in the engine room. Two breakers for each engine. one circuit goes straight to the engine. The other goes to the start circuit. The start circuit has no continuity from that breaker up to wiring at the helm. most likely a break somewhere. now to find out there.

[Rob Schepis]

The buzzer is powered by the power that is fed through the harness to the instruments via that engine mounted circuit breaker that Tony referenced. Whether or not the buzzer sounds is controlled by the PCB at the helm instrumentation.

Can you elaborate more on your comments about the engine “revving hard” ?
What type of controls do you have ?

[Rob Schepis]

To me you have two issues:

Fuel gauge: You answered you’re own question as to it being normal to show a reading when the key is off. The STBD does, the PORT does not, so assuming they are wired the same something has gone amiss. Normal for fuel gauge power is either at key on or via a dedicated switch on the dash. You need to understand exactly how they are wired. Follow the wires by eye and use a handheld meter or a test light and follow that fuel gauge circuit and see where it’s getting it’s voltage.

Erratic Voltage: What exact engine? Sure sounds a lot like the symptoms of a loose connection at the engine mounted circuit breaker or the harness going back to the dash gauge.

[Rob Schepis]

Matt,
Further to Tony’s recommendation, I would setup DVM’s to each bank and post a wiring diagram of your setup.
https://www.sbmar.com/articles/installing-digital-volt-meters-dvm-boat/%5B/url

John,
Sounds like an issue at your “engine mounted circuit breaker” that feeds your helm….. do some searching on this forum for those terms with me as author. Again, DVM’s would be key here as to diagnosis..

1 user thanked author for this post.

Tony Athens

[aarb612]

If you follow your engine wiring harness you may find the red circuit breaker mounted elsewhere. My boat is similar vintage and it is located off the engine as well.

[Rob Schepis]

I’m on a phone, no access to a PC at the moment, so can’t post a link, but do a search in these forums for engine mounted circuit breaker me as author. You may have a loose connection.

1 user thanked author for this post.

Tony Athens

[chris mason]

I checked and renewed the connections to the engine mounted circuit breakers.
Did not help…..
I’m not getting power to the engine run and shutdown solenoid at the governor.
Also no power to any of my gauges

[Rob Schepis]

Have you checked “engine mounted circuit breaker” and it’s connections?

Use the search function with me as author to see what it is and what it does.

[Rob Schepis]

Plenty of info posted on it: https://www.sbmar.com/community/search/engine+mounted+10+amp+circuit+breaker/?gdpos=power-search-request&gdpos_search_users_input=rob

[Rob Schepis]

Kevin Carlson wrote:

It appears the only thing I can check is the 10 amp fuse that goes to the ECM. Would this red button be that fuse?

No, that’s the circuit breaker for the engine harness back to the helm. Plenty here on that: https://www.sbmar.com/community/search/engine+mounted+circuit+breaker/?gdpos=power-search-request&gdpos_search_users_input=rob

See attached pic – air heater control fuse should be in here

[Rob Schepis]

Have you checked the connections at the engine mounted circuit breaker? Plenty on this site about it to be found via the search function.

[Rob Schepis]

“….was surprised at how it takes out the whole harness and effects many things”

Yup, if it goes or connections come loose it’s just like turning of the key switch!

[Rob Schepis]

Search the forum here for “engine mounted circuit breaker” with me as author.

[Rob Schepis]

Yes, the filter head is a good location. To be thorough, did you secure the gauge in place and monitor the pressure at different rpms once the engine comes up to full temp?

No, the circuit board will NOT effect your instrument readings. It is for alarm/buzzer only.

Sounds like losing some voltage from the engine to the helm. Of course bad grounds can do this but another culprit is this 10amp engine mounted circuit breaker. Check it out including the ring terminals underneath it.

[Patto]

Gidday,
Gotta say how great this site is. Full of useful info.
Just picked my dream boat after too many years of searching and procrastinating….. and now it begins.
Would anybody know what the circuit breaker that is mounted on the lifting lug, actually does and what would trip it out.
Both engines suddenly shut down and we lost all power to the ignition, as well as respect from the better half. After searching we found the circuit breakers and reset them and all is good.
Any ideas or help is greatly appreciated
Thanks in advance
Patto

[Rob Schepis]

Have you checked this breaker? that’s were power for your instruments/ignition leaves the engine room…

https://www.sbmar.com/community/topic/6cta-circuit-breaker/

[Gene Prather]

The 10 amp engine mounted circuit breaker tripped this week. We had been underway for about 10 minutes, still just above idle as we stowed fenders, when we got a low voltage alarm on the engine panel, gauge showed less than 10v. Increased RPM to 1,000 and the alarm went away only to return about 30 seconds later and then the engine shut down completely and all power to the control panel was lost.

Thinking back to our last outing I now remember that we got the same alarm at low RPM but with a slight increase it went away and there were no issues.

The engine is a 6BTA5.9-M3 circa 1999. We are the 3rd owner of the boat but the breaker looks like it still had the original paint on the mounting screws. I’ve gone through connections, cleaning, tightening and applying Corrosion Block.

On Tuesday I will order a replacement breaker but is there anything else that I should check? Continuity in the wiring harness to the panel was good.

After 20 years could it be as simple as a failing circuit breaker?

Thanks,

Gene

[Rob Schepis]

“Cranks are only monitored via the standard cummins gauge (which I think may be a bit dodgy on the port side as it reads very low)”

12V at the helm is fed by the engine mounted 10amp circuit breaker. If you’re engine package voltmeter is doing as you say check the connections under the breaker. Here’s a prior thread about it.

https://www.sbmar.com/community/topic/engine-mounted-circuit-breaker/

[Rob Schepis]

Those pressure gauges are gear pressure.

As to your low voltage issue, check the connections under the engine mounted circuit breaker. This feeds the helm instruments. Attached is a pic.

And so you you are not driving blind as to what is actually happening at the batteries consider the DVM install:

Installing Digital Volt Meters (DVM) on Your Boat

We’ve just added an assortment of DVM faceplates:

SMX Digital Voltage Monitor

[Rob Schepis]

Check the red push button 10amp CB. Next to the aftercooler at the rear lifting ring.

I would post a pic or link but I’m on a dumb phone at the moment. You can search for it as we have had a few posts here already, pics included.