I am trying to work out how the wiring on a newly acquired (secondhand) mower works. I have what are supposed to be the wiring diagrams for it but none matches exactly. The current (ha, ha) conundrum is the meaning of the letters on the regulator. It's a Hatz diesel engine and has an alternator with a separate external regulator. I have the Hatz manual but that is no more forthcoming than the mower wiring diagram. The regulator has terminals marked with the letters G G L C W. I can work out that the G G terminals are for the output from the alternator but the others have me rather stumped. The W terminal is not connected in any of the wiring diagrams I have. The C connector seems (in most cases) to be connected to switched battery +ve, i.e. it will get 12v on it when the ignition is turned on. The L connector has me totally confused, it's connected to the engine hours meter and thence via an 82 ohm resistor to something that will be at 12v when things are running normally. The regulator is connected to ground/0v by its case. The alternator has a connection direct to battery +12v in addition to its two G G connections. The Hatz engine is German so the letters may mean something in German. I'm not at home at the moment so I can't provide a picture or much more detail. Any information or pointers would be most welcome.

Possibly, what's the German for tachometer? :-)

Alternator regulator on mower, G G L C W terminals, meaning?

Apr 22, 2018 27 Replies

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Dave Plowman (News) 8 years ago

Only time I've seen this is on alternators built into the flywheel, etc, where space would be at a premium. Most rely on the alternator cooling fan to keep them cool too.

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Roger Hayter 8 years ago

What's the voltage of a '12V' lead acid battery?

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Chris Green 8 years ago

My mental arithemtic isn't what it was! :-)

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Chris Green 8 years ago

Depends if it's on charge or not.

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Dave Plowman (News) 8 years ago

I tend to calculate car things based on 13.8v.

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Martin 8 years ago

So has my MD2B marine diesel engine

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Thomas Prufer 8 years ago

Anway these translations

Field -- "Feld" generator -- "Generator"

are unlikely to help:-)

Thomas Prufer

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Dan S. MacAbre 8 years ago

Have you seen the manual here? Although I guess you probably have a paper copy.

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In the circuit diagram for current and voltage measurements, the W terminal is labelled '22'. The designation for 22 is "Terminal W for engine-speed measurement". It looks like L is supposed to go to a display panel.

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