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Alternator won't let diesel engine shut off
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Posted by jdemaris on April 25, 2005 at 20:13:05 from (209.23.30.201):
Just had a little problem and wondering if anyone has come up with a different way of fixing it than I did.
I changed over my Case 580Ck diesel from 12 volt generator to 12 volt alternator. I wired it for a charge indicator light and ammeter. Also, at the same time, I removed the manual diesel shut-off from the RoosaMaster injection pump and installed an electric solenoid shut-off.
Started it up, charged fine, but could not shut it off with the key. I had to cut the wire to the injection pump. Now, I know why this is happening - I guess - but I've never had this problem when wiring a gas engine with a battery coil ignition. I'm figuring that the electric diesel shut-off takes less current to energize than a battery coil does to run an engine and enough current is coming through the bulb?
The indicator light is supposed to go out when the alternator starts charging because it is then getting equal voltage on both sides of the light bulb - therefore no current flow. So, in this case, seems once the alternator is charging, the current is backflowing through the bulb and making its way to my injection pump. I took a diode and put it in-line with the ignition feed to the idicator bulb and now it works fine. I've never encountered a diode in such a system before, and I'm wonder, what other ways are there to work around this? I assume if the ignition swith is an automotive type with a separatge ACC and IGN terminal it could be done that way since those two terminals are isolated when the key is off. But I'm not using such a switch - I've got a diesel tractor switch with a built-in glowplug position and an IGN terminal - no ACC.
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