From Niehoff to Delco

I have a 7040 that I had since 95 only run like 50 hrs a year .I replaced the alternator it had a Niehoff on it.The new  Niehoff only lasted 100 hrs or so paid 700.00 for it I think .Over the years I just charged the bat every few days .I got a Delco to put on it .There are 3 wires on the tractor and places for 4 on the Delco  the bat and 3 on the plug . how do I hook this up I know were the bat wire goes that was easy ........... thanks

It's been a while since I've worked on one, so hopefully Steve or somebody else will verify...

What model Alternator are you trying to use? Some Delco units can be direct replacements, some aren't. What was the Neihoff model # that was on the Tractor? I can tell you what Delco unit to use if there's a direct replacement for that particular Neihoff. One other thing, if you only got a year out of the Niehoff, you obviously have a problem on board that Tractor that's causing the problem. I would check into that first, make the necessary repair, and then have a good rebuilding shop look at the Neihoff for you to repair it. Niehoff, Denso's Motorola's etc are not cheap units to purchase. They are usually good reliable units, but like anything else, if there's a problem on board somewhere that would cause them to fail, the replacement unit you're putting on can fail just as fast. You'll be broke if you keep doing that, and the Tractor still will not be performing the way it should.... HTH

I got the pin info from the seller of the what I think is a delco here is a pict

The 10SI has three terminals (including those with a 1 wire regulator).

The large "BATT" terminal which gets connected to your battery positive. (Or Terminal Post if your vehicle is so equipped).
And a dual terminal connector. (Repair pig-tails for this connector available at any autoparts store. Or, salvage with alternator if pulling the alternator from a vehicle).
The #1 Terminal. (Marked with a "1" on the case)
This terminal is used to connect to the dash warning light.
For the warning light, a lamp is wired in series with a switched voltage source. During normal operation the lamp stays off. If the regulator is damaged, the #1 terminal provides ground, and the warning lamp will light. Usually.
This terminal is also active on 1 wire regulator equipped 10SI alternators.
The #2 Terminal. (Marked with a "2" on the case)
This terminal is used to excite the 10SI into operation. (3-wire 10SI)
It is connected to the battery positive.
For simplicity you can connect the #2 connector pigtail directly to the "batt" terminal on the alternator.
The terminal is present on 1 wire regulators. Used only for those that require the stock connector to fit snugly.
If you are converting from a 3wire 10SI to a 1 wire regulator you can hook up all your stock connectors, and run it as is. However, thats wasted money unless you plan on cleaning out some wiring under your hood.

If the 1 wire is for cleaning out wires, you only need to retain the "BAT" wire. The #1 & #2 terminal wires can be eliminated. Don't be surprised to find that the #2 wire only goes a short way into the harness and spliced into the "BAT" wire.
The 1 wire regulator comes with a dust plug for the #1 & #2 terminals.


--------------------------------------------------------------------------------

Some other tidbits available from AC Delco for wiring up a 10SI, is wiring package 1870921 (for those 6 to 12volt conversions). This contains the terminal connector AND an extra resistance wire pigtail to connect to the ignition system (don't use a ballast resistor if you use a resistance wire). Also available is an ammeter package (1965400).

Use a voltage guage to monitor your charging system. It will definately give you signs of impending problems. (Bad regulator, failing battery, etc.)