VicS
Well-Known Member
Meaning do what precisely?
No power to Yanmar ignition. SWMBO turned off using key instead of button
- Thread starter sealegsjim
- Start date
Meaning do what precisely?
single
Well-Known Member
2nd that, spade had come loose on the back of the switch.
single
Well-Known Member
Other thing i had with the same symptoms was caused by a loose connection in the main loom multi-plug that joins engine harness to instrument harness.
Sharkx
Well-Known Member
I heard that switching the key off while the engine is running would blow the alternator.
single
Well-Known Member
And me.
Uricanejack
Well-Known Member
By pass the ignition circuit and system by using (a well insulated) screw driver to short across the solenoid to the starter moter from the power supply.
Can't say I've ever done on a boat. got my car going a few time though.
Get you home bodge not recommended as routine. usually blows lumps out of screwdriver.
Look along the high tension wires from batteries
one side is to ground. The other goes from battery to solenoid then from other side of solenoid to starter moter.
Not familiar with OPs motor. some more modern starter moters have solenoid attached as single unit.
It can also be done using a jumper cable direct from battery to the starter.
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VicS
Well-Known Member
Disconnecting or switching off the battery while the engine is running is what is likely to blow the alternator diodes.
The alternator output is not routed through the key switch so switching off the key switch is no problem it will however switch off the engine instrumentation and disable the warning lights. With engines with a stop button, like the OP's, it is also likely to disable the stop circuit.
VicS
Well-Known Member
There are three terminals, ITYWF, on the starter motor solenoid. What happens rather depends upon which ones you short.
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single
Well-Known Member
Not much good if engine stop solenoid is involved in the circuit though.
Lakesailor
Well-Known Member
Take a wire (or a screwdriver) from the power in cable to the solenoid feed tab (big fat one that comes from the battery and apply it to the solenoid spade connector tab). It doesn't have the explosive effect of shorting out the power terminals, but activates the starter the way it is meant to.
VicS
Well-Known Member
But avoid actually starting the engine because with no power on the panel the stop circuit will be inoperative
VicS
Well-Known Member
No high tension.... its all 12volts.
Bobobolinsky
Well-Known Member
Short across the solenoid to see if there is power at the engine, though I suspect that there isn't, suspect battery connection or connection at the primary isolation switch
Bobobolinsky
Well-Known Member
It won't start without the stop solenoid being energised, it defaults to off
sealegsjim
Well-Known Member
Take a wire (or a screwdriver) from the power in cable to the solenoid feed tab (big fat one that comes from the battery and apply it to the solenoid spade connector tab). It doesn't have the explosive effect of shorting out the power terminals, but activates the starter the way it is meant to.
Thanks for that Lakesailor (I'm on the same lake!) and all other forumites who have taken time to reply. I am very grateful. My Yanmar is less than 10 yrs old and it has the solenoid 'built in' to the starter.
State of progress - all connections to ignition switch are fine. No power to it. Battery switch (single on/ off ) operates 2 batteries wired in parallel - plenty of power. Switch operates fine. I have just discovered that there is no power to the starter connection from the battery (via battery switch) So somewhere between the cable from battery switch and the starter connection there must be a break. The battery cable disappears into the bowels of the boat and is it likely that there is a connector somewhere on the line.
Talulah
Well-Known Member
Are you sure? Our Yanmar is the opposite. Hence you can start the engine without the key if needs necessitate. To stop the engine without power reduce revs to idle. Put palm of hand across air intake.
Vitesse
Well-Known Member
Will you try a temporary easily routed new cable before delving to remove & replace the old?
Talulah
Well-Known Member
You could run a new cable just to check but are you sure the fault is on the positive side not the negative side.
sealegsjim
Well-Known Member
I connected a bulb from the positive connection at the starter to earth and there is no power so I presume the fault must be on the positve side. I will try and run a temporary wire from the battery switch to the starter connection to see if there is power. Unfortunately, I don't have a spare battery cable with me.
pampas
Well-Known Member
Think there is a fuse in the engine loom very close to the alt, and near a multi plug on the Starbd side, not easily reconisable.
