Posted by JMOR on December 21, 2008 at 10:14:40 from (76.187.218.177):
In Reply to: 1 wire alt. posted by riverbend on December 20, 2008 at 10:03:32:
John M said: (quoted from post at 09:47:08 12/21/08) Plumb a normally open oil pressure sending unit into the line to the gauge. Run your wire from the alt to that, then the gauge. When the engine runs, the circuit is closed and the alt charges, not running its open and doesnt drain the battery, and its hidden and out of the way, and no extra wires or switches to install.
Is that an idea, or have you actually done it? Reason for asking: alternators can put out 50 to over 100 amperes (model dependent) and a typical oil pressure switch turns on a milliampere 'idiot' light bulb.
Just asking.
Some manufacturers (MF diesel for one) use an oil pressure switch to power the field Excite line on 3-wire alternators at about 4 amps. But that is not the 1-wire type being discussed here.
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