Ford 4000 alternator

S.B.Hahn

New User
Hi there. My granddad recently got his old Ford 4000 repaired after the head gasket blew. He had the guy repairing it put in some new gauges(none of the old ones worked). The guy took out the original gauge panel, and put in an ugly piece of black plastic with only an oil pressure and engine temp gauge.

I'm intending to put the original gauge panel back in after making some modifications to it.

Anyway, my question is about the tachometer. The guy who worked on the tractor replaced the generator (which also didn't work) with an alternator, one made for a Chevy truck, I think.

Since the tractor doesn't have enough RPMs for the alt., he put a smaller pulley on it. Does anyone know if I can install a tach drive on this particular alt., and whether or not the RPM reading will be accurate, with the smaller pulley (which I think makes the alt. spin faster than the engine)

The alternator is a "Delco Remy BG" stamped with the numbers 21201118, and bearing a sticker with 7127SW3 on it. It is a single wire, and starts charging once the tractor is revved up one good time (it doesn't stop until the tractor is off, according to the "mechanic"). It has a built in charge regulator, which keeps it from overcharging the battery.

The tractor is a 68 model Ford 4000, 4 cylinder.

Any help is greatly appreciated, thanks in advance

S.B.Hahn
 
Wow i feel like i'm on the
ford forum tonight lol this was brought up recently someone did find a alt. with tact drive the rpm's were very close and the was very happy. Sorry to be the bad guy but your alt. can't be hooked up for the tack unless you go with a electric tackmeter if no one can help you here you might have better luck asking on the ford forum.
 
so a normal tachometer(RPM Gauge)won't work with an alt even if I install a tack drive? or will this specific alt simply not house a tack drive?

I don't intend to use the original gauges, by the way, just the original gauge panel(none of the original gauges work. I'm going to set my new (lighted) needle gauges behind the glass in the old gauge panel, and try to find a metal sheet material similar to what was originally in it to use as a backing.

by the way, were the original gauges not electric, or do you mean I'll need a digital gauge? Can I get a digital needle gauge?{digital tack drive signal reader but analogue needle display} Or can I only get tack drive readers with digital display, like a digital watch, as in this: [01:03 AM]

If not this alt, what would you suggest? Preferably something cheap ($100&less) that either comes with a tack drive or is able to house one if I get an installation kit.

Also, I'm not quite sure what kind of fuel gauge/sender kit to get. I want one that'll fit the tank well (I know for a fact the original sender is broken), but I think gauge in the replacement kit from ford might be too big for my purposes. I'm going to need my gas gauge to be 1" in diameter or less, as I'm going to try to fit more in the panel than what it originally came with. (5 instead of 3, other than the fuel gauge, I'll be putting in a battery gauge 1" or less, and oil pressure & engine temp gauges 3/4" each, and hopefully a tachometer in the center 2-3" )

Can I even get(reliable)gauges that small, or is that just wishful thinking?
Any advice is appreciated.
Thanks
S.B.Hahn
 
And one other thing, I don't necessarily need an rpm log (the thing that looks like the mileage recorder in a car, or something like this: [000243420}).

What I want is a needle gauge that'll tell me my current RPM's.

I also want to know if the different sized pulley (different from what was on the generator), and by consequence, the alternator's differing speed from that of the engine, will have any effect on the accuracy of an RPM gauge (tachometer).
 

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