Kohler 5ecd blowing fuse

Coz

Active Member
Oct 9, 2018
443
Boat Info
2008 Sundancer 310
Engines
Merc Mag 350 DTS w/Bravo III
I have a fuse (f6) that is on the output of the battery charging voltage regulator. Holds fir a while but eventually blows.

When it is holding, the gen puts out 3.5a to the battery. I checked with a dc clamp meter. when fuse is blown, the gen draws 8a from battery.
Wouldn’t think gen would need 8a for controls

Does that sound like the regulator going bad?
 
Isn't F6 supposed to be 15A fuse? Are you seeing > 15A when it blows? What happens to generator when F6 blows? From what I can tell it should still run, F6 is sort of optional and only there to charge the external battery. So perhaps your battery is bad and requiring too much current. Try turning your 120VAC battery charger on to supply majority of current to battery instead of voltage regulator on generator. See if that helps, which would further point towards bad battery.
 
F6 is for charging and probably not needed with my other charger. Batteries are 2years old and seem to be ok.

just not sure why the gen uses 8a from the batteries unless the voltage regulator is bad. the regulator would provide power to charge the batteries and to supply control power to the gen.

My ac charger will do the job but I have a 30a charger. gen takes 8, 2 blowers take 8, frig takes 4. that doesn’t leave much for charging the batteries.
 
I'm pretty stumped. 8 amps from the batteries def seem very high. Is there an easy way to measure the current through the fuses? Would be nice to get measurements on F2, F5 and F7 at two conditions: For the first few seconds when the generator is powered on but not yet cranking, and then fully running. I think the first condition is important since all the electronics are on.

Can you unplug the regulator entirely and measure the current? That should prove or disprove your theory of the regulator.

Where are you measuring the 8 amps? I can try to get you a comparison value from mine.
 
Can’t even find the regulator.
I put clamp on amp probe on the main cable coming from the battery guess that’s going to the cranking solenoid.
Guess 8a is reasonable given that f2 and f3 both 10a are connected to the battery. they power the remote interface, main controller and relay board.
 
I think the regulator is under the top panel mounted along heat exchanger side.

At least by process of elimination since I know the other two modules are SCR and Solid State Relay.

kohler_regulator.png
 
I thought that was just a relay. Maybe if I had a part number I could see what a new one looks like
 
I confirmed with part number. You have the relay and regulator flip flopped. I’m gonna replace the regulator. I can get an aftermarket one for $70
 
Ok, sorry about that. I figured the SCR was that since you can see the twisted pair orange/yellow wire as shown in wiring diagram:

scr.png


So I'm a bit confused and not close enough to check it out myself, so just going off old pictures.

Anyways, let us know if it solves the problem.
 
I am experiencing the same problem with the f6 fuse blowing and draining its battery.
I have to keep the generator battery connected to the house batteries and they are maintained by the house charger.
If I connect the Kohler to its battery only, it will kill it in a matter of a couple of hours. With the generator not running. In the “auto mode” does the Kohler draw tons of power?
 

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