Posted by Bob M on September 23, 2010 at 09:20:16 from (74.67.186.145):
In Reply to: Alternator Conversion posted by Matt Weltz on September 23, 2010 at 02:31:48:
Matt - Here are a few options for alternator wiring:
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1 - Presuming your MD has coil and distributor ignition (ie NOT a magneto!) connect the alternator's #1 aux terminal to the coil side of manifold switch. As soon as the engine starts on gas the alternator should begin charging. It will continue to charge after switching to diesel mode and the power to the ignition is cut off.
The downsides: -If you use a warning light, it will be functional only when the engine's running in gas mode. -If the engine spins to too slow on gas, the alternator MAY not begin charging. Solution is to swap in a smaller pulley onto the alternator. -If you forget to flip the decompression lever back to the "run" position after shutdown it can drain the battery thru the alternator #1 terminal.
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2 - Wire a simple momentary pushbutton switch between the battery + and the alternator #1 terminal. After starting the engine, push the button for an instant to start the alternator charging.
Downside here is remembering to push the button at startup.
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3 - Install an oil pressure switch in the oil gage line. Then wire from the battery + to the pressure switch then to the alt #1 terminal.
You however must use a switch with a normally open contacts - ie. contacts that CLOSE when oil pressure is sensed. (This opposite from the standard oil pressure idiot light switch used in most cars.)
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4 - Use a "single wire" alternator and dispense with the aux wiring entirely. I however don't recommend this for several reasons: - One-wire alternators cost more than a standard 3-wire. - Most 1-wires must be spun up quite fast to cause them to start charging. Your MD may not spin it fast enough. - Some (not all...) one-wires suffer from excessive standby current draw. Thus an engine sitting unstarted can drain a fully-charged a battery in a matter of a couple weeks unless the battery ground cable is disconnected.
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