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Tractor Alternator

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Dsims

10-26-2005 17:39:17

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Alternator expertise needed. I converted my Leyland 154 tractor to an alternator after the generator failed (generators aren't available). This involves rewiring (to eliminate the voltage regulator) and also reversing the tractor's polarity since the tractor is originally positive ground. I did all this sucessfully with one small glitch. The alternator (which came from a Leyland parts supplier) has a positive (+) post which I connected to the battery circuit. It has another post labeled "W". I discovered that the alternator does not put out voltage on startup unless a jumper wire is used to momentarily connect the + and W posts. Then it puts out 14 volts as long as the engine runs, but you have to do this every time you start. I only touch the wire momentarily because it seems to draw a lot of current and shouldn't be connected all the time. I've thought about connecting a wire from W to the starter solenoid circuit, with a large resistor in the path, so the alternator would get its short voltage "prime" when starting but no big current draw. I'm hoping someone knows about this and can explain the W post to me as well as how to wire it. Thanks.

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cj3b_jeep

10-27-2005 05:50:32

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Re: Tractor Alternator in reply to Dsims, 10-26-2005 17:39:17

I would think that this wire should have a charge light in the middle of it. As I understand it, this will give the momentary jolt of voltage it needs to excite the alternator, then disconnnect itself. It"s a very strange concept to grasp, but it does work. Also, I took my alternator to a guy down the road from me and he did something to the insides of it so it begins to charge at around 800 rpm instead of the 1200 it used to take.

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MLP

10-27-2005 03:41:51

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Re: Tractor Alternator in reply to Dsims, 10-26-2005 17:39:17

I have a one-wire alternator that I can either use a momentary push button switch or I let the tractor warm up and crack the throttle wide open for a � of a second to get it to charge. Some alternators will not put out at all at low speed but once they are revved up they will continue to operate until they are shut down.

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JDknut

10-27-2005 03:44:55

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Re: Tractor Alternator in reply to MLP, 10-27-2005 03:41:51

My Deere is like that. Gotta rev it before the alternator will put out.

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Bob M

10-26-2005 18:11:22

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Re: Tractor Alternator in reply to Dsims, 10-26-2005 17:39:17

I'm unfamiliar with the alternator you are using. However it sounds like it works same as the Delco internally regulated units.

If this is so, inserting a small lamp between the ignition switch and the W terminal should solve your problem. It will provide the necessary current limiting, AND it will work as a charging system warning light (i.e. it will light if the charging system quits whenever the ignition is on).

Use a 12 volt lamp rated about 200 ma or so - like a #168 or #194 side marker/instrument panel bulb.

Alternatively you can install a separate pushbutton switch in the line to the W terminal and push the button momentarily to "flash" the alternator at startup. But you will have to remember to push the button at every startup.

I'd recommend NOT using anything wired to the starter solenoid, etc. There are some nasty voltage transients generated when the starter kicks in and out - transients sufficient to blow out the alternator electronics.

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