Fuse's Blown

[237traveler]

I have a 1977 26" C&C with 1GM10 diesel motor. Issue the control panel is wired to battery with inline fuse. When I place new fuse in and turn on key, the sound emits and as soon as I push the start button the fuse blows????? Its intermittent but Saturday it blew 4 fuses and never could get it to start. Any ideas, thanks in Advance.

[GordMay]

What size (amperage) fuse are you using? It looks like it should be 30A.

[osirissail]

Basic stuff, if the fuses blow every time you press the "start" button, and it did not blow "before," then assuming you are using the proper sized fuses, there is short somewhere in the starter button to starter solenoid circuit.

First disconnect the wire from the starter button to the starter solenoid at the button. If the fuse blows then you have a short in the starter button.

If the fuse does not blow then reconnect the wire and disconnect it from the starter solenoid at the starter. If the fuse does not blow then there is a short in the starter solenoid. If the fuse blows then there is a short in the wiring from the button to the solenoid.

[237traveler]

Thanks I will try that and see what happens, first time it blew out it had 25 in it maybe its been wrong all this time.

[familycruisers]

If its blowing a 25 you got issues. Follow Osiris advice. A meter would help too, and save a couple of fuses.

[osirissail]

The only thing the "starter button" powers is the starter solenoid. Whatever the ampere rating of that solenoid is - is what your fuse rating should be (plus a little). Or switch to a "slow blow" type fuse.

[fairbank56]

Should be 30 amp slo-blow fuses. There are two coils in the starter solenoid. Initially, both are in use when first starting as a much higher current is required to engage the pinion gear. Before the solenoid is fully engaged, it could easily draw 25-35 amps. After the solenoid is fully engaged one of the coils is shorted out and only the holding coil is in use which requires only around 10 amps to keep the solenoid engaged. This is the reason many setups, including modern Yanmar systems, use a slave solenoid mounted on the engine. Much less current is required to operate the slave solenoid so you don't have this high initial current through your start switch.

Eric