2007 Instrument Panel Wiring Issue

[Caspurr]

I have a 2007 Hunter 33. Today I turned the key and the engine did not turn over. Batteries are about 12.3V ea (1 Starter and 2 House).
I pulled of the instrument panel and it looks like someone ran a new wire (White in Picture) between the Starter Unit and the Fuel gauge.
The end of the wire that was connected near the fuel gauge was off and I am not sure which terminal it was connected to.
Does anyone have a picture or clear schematic of this wiring?
Thanks,

 

[twalker H260]

P184 of the engine manual has the basic schematic of the ignition/engine portion of the panel.

https://sbo.sailboatowners.com/downloads/Yanmar_3YM30_Service_Manual.pdf

My read is that the two blue wires are to the glow plug relay. Can’t tell you what that white wire is supposed to do.

Maybe part of the fire suppression system meant to be wired to the engine shut down?

 

[Caspurr]

Looks like the White wire is wired to G2 which is one of the Glow Plug Wires which also looks connected to the Starter Motor.
To start the engine 30, G2 and 17 all need Battery supplied by turning the key.
If fo some reason the Key switch is not supplying battery on G2 someone could have wired it to the battery on the fuel guage as it gets battery when you turn on the key.
I will check today to see if 30, G2 and 17 have battery when I turn the key fully to start the engine.

Has anyone else had this problem or fix wrt the key switch. Maybe needs to be replaced.

 

[Caspurr]

After much troubleshooting traced trouble to a bad connection on Starter. Obviously started on the wrong end.
The extra white wire must have been a fix for my fuel guage (12V supply from G2 as it is not working now.
I can deal with that at a later date.

 

[twalker H260]

G1 & g2 look to go to glow plug relay. I think you have a separate switch position for glow? They should only have 12v when switch(key) is in that position.

 

[MikeHoncho]

You should have three terminals on the gauge. Neg, pos. and T. The T is for the sending unit.

 

[Caspurr]

Yes...Battery was in all the right places when the key was turned to start position. White was the power to the starter. Found the white on the starter and the connection was bad. Used contact cleaning grease and starts every time now.
May run a new #10 power feed this fall to make sure it is fixed permanently.