Re: 12 volt conversion but tractor not shutting of

Posted by Clooney on May 31, 2003 at 16:02:58 from (172.170.59.126):

In Reply to: 12 volt conversion but tractor not shutting off posted by Jesse on May 31, 2003 at 12:29:48:

Jesse, I'm primarily a Deere man but installing of an internally regulated Delco 10-SI alternator is basically the same on all tractors.

........Below is a couple of paragraphs from my Deere alternator conversion installation instructions........

~ An inline 10 ohm [2 watt + ] resistor should be installed [in series] in the wire running from the coil terminal on the ignition switch to the alternators [#1] terminal, [that resistor isn't required for the alternator to actually operate, but is put there to protect the diode trio inside the alternator from damage due to a power surge]. Make sure the resistor isn't taped inside the harness or placed close to anything that will burn as it gets quite hot when the ignition switch is on and the alternator isn't charging [I usually install the resistor at the ignition switch].... While a little over kill, the Radio Shack 10 ohm 10 watt p/n- 271-132 works very good and is under 2 dollars.

~If the system charges, and the engine shuts off promptly when the ignition switch is turned off at high RPM, that's all you need to do. If the engine won't shut down consistently, or wants to run on a little after shutdown, or you just want to make sure it will always shut down correctly, then you can install a 1-2 amp 50 volt diode [in series] in the wire that is run from the ignition switch [coil terminal] to the alternator [#1] terminal. The diode is installed in series and in addition to the added 10 ohm resistor. The diode must be installed with the polarity indicating [stripe, dot, k, +, or cath,,,,, "cathode side"] towards the alternator and the [non] marked [anode] side towards the ignition switch. That diode is placed in the system to keep the alternator form back feeding the ignition coil when the ignition switch is shut off. Not all systems need that back feed protection [depends on the ignition coil] and once the alternator stops charging after shut down there is no additional power flow [from] the alternator #1 terminal to the coil terminal on the ignition switch. I always include that diode in any conversion as it is easy and cheap and it won't have to be added later if a shut down problem arises. While again, a little over kill, the Radio Shack p/n 276-1141, 3 amp power rectifying diode will work good and is well under 2 dollars.

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