Hitachi LR155-20 Alternator question

[dandrews]

Getting ready to put my 3GM30 in to the boat and was checking everything over and something I discovered has thrown me for a loop.

The alternator is a Hitachi LR155 unit, 55 amps. The usual Batt & E connections and the Molex connector for LR.

What has thrown me is that there is a white wire coming out of what looks like a vent slot that is not connected to anything. Not even a connector on the end of the wire.

What is the world is this? I spent a lot of time today searching here and on the internet at-large but find nothing about this.

Can someone educate me on this wire. Should it be connected to something and the connector has just missing?

This engine was rebuilt last year by a Yanmar dealer/repair shop but sad to say the owner past away so I can't go back to ask there.

Posted a picture of the wire. It looks gray but that is overspray when the engine was painted. It is white. It is the wire hanging across the oil filter.

Thanks,

Don

[DotDun]

Originally Posted by dandrews

Getting ready to put my 3GM30 in to the boat and was checking everything over and something I discovered has thrown me for a loop.

The alternator is a Hitachi LR155 unit, 55 amps. The usual Batt & E connections and the Molex connector for LR.

What has thrown me is that there is a white wire coming out of what looks like a vent slot that is not connected to anything. Not even a connector on the end of the wire.

What is the world is this? I spent a lot of time today searching here and on the internet at-large but find nothing about this.

Can someone educate me on this wire. Should it be connected to something and the connector has just missing?

This engine was rebuilt last year by a Yanmar dealer/repair shop but sad to say the owner past away so I can't go back to ask there.

Posted a picture of the wire. It looks gray but that is overspray when the engine was painted. It is white. It is the wire hanging across the oil filter.

Thanks,

Don

Output for a tachometer ('W' lead??). You don't use it as the 3GM30 has a flywheel sensor to run the tach.

[dandrews]

DD, thanks for that information.

Makes sense, I was sure the guy who did the work would not overlook something, he was very dedicated to his profession.

Don