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Old 26-01-2011, 01:23   #1
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Open 12vdc Switch on Yanmar 4JH4-TE

Yanmar 4jh4-TE reduces the 12 VDC voltage from the starting switch to the engine to 5 VDC. My battery Smart Regulator asks for: "It must be turned on with a normally open oil pressure switch, ignition relay, or other switch that has no other loads on it to cause a voltage drop or "sag" that produces 12 VDC when engine is running.
I have been advised by a Yanmar dealer not to cut into the harness. How do I connect connect the alternator Smart charger to the Yanmar?
Any one?
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Old 29-01-2011, 16:07   #2
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Use a relay. 12 VDC from any constant source on the line side of the relay and the regulator fed from the load side of the relay. The trick is going to be finding a 6 VDC operating relay but a little looking thru Digikey, Grainger, JC Whitney, etc. should yield one that will work.

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Old 30-01-2011, 00:59   #3
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12 VCD

Thanks for your reply. Could I connect the smart charger sensing wire directly to the ignition switch START/ON (12 VDC) without the use of a relay?
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Old 30-01-2011, 08:31   #4
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Sure. Just run large enough conductor to minimize voltage drop between the key and the alternator regulator.

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