Yanmar 3gm control panel

[Tomahawk]

Suddenly not lighting up.
Does anyone know off hand which one of the wires behind the panel is the main power supply?
It's one of those penels with a start and stop buttons and a key to liven it all up?

And where on the engine loom does the juice come from.

Ta in advance.

 

[VicS]

Suddenly not lighting up.
Does anyone know off hand which one of the wires behind the panel is the main power supply?
It's one of those penels with a start and stop buttons and a key to liven it all up?

And where on the engine loom does the juice come from.

Ta in advance.

It is a red wire ..................... See the wiring diagram in the owners manual

Check the 30 amp fuse in the engine wiring loom. Power comes via this fuse from the main battery terminal on the starter motor solenoid

 

[Tomahawk]

Ta muchy..

Workshop manual is ashore....

 

[Spyro]

Red wire on to one side of the key switch

 

[Tomahawk]

Thanks both for your help.

I traced the wiring through but got very confused. I had 12v at the starter motor and on the panel. But nothing was happening. Every time I tred to start the engine the lights went out, but I still had voltage where I should have it.

In desparation I started taking everything apart and putting it back togethee. In the end it turned out to be bad connections on the main isolator switch. Cleaned up everything and tightened the terminals and all now working.

Lesson learned, voltage does not always equate to sufficient supply when cranking the engine.

 

[VicS]

Thanks both for your help.

I traced the wiring through but got very confused. I had 12v at the starter motor and on the panel. But nothing was happening. Every time I tred to start the engine the lights went out, but I still had voltage where I should have it.

In desparation I started taking everything apart and putting it back togethee. In the end it turned out to be bad connections on the main isolator switch. Cleaned up everything and tightened the terminals and all now working.

Lesson learned, voltage does not always equate to sufficient supply when cranking the engine.

You were no doubt using a digital meter!

They take so little current that they will often give a normal reading even through a bad connection and guaranteed to make a fool of you sooner or later.
A test lamp ( eg an old car headlamp bulb with one good filametn on a couple of leads) is a better tool for tracing this kind of trouble.