Generator to Alternator

How do I switch my generator to an alternator on my 606D and still get the Amp light to work properly. I only have an alternator now and the old regulator is still wired and the Amp light is on all the time.
Thanks

Old regulator should not be wired in. Assuming you used delco alternator it should have internal regulator. Check archives for proper wiring diagrams. Not sure but running alternator through old regulator may have damaged alternator

If the alternator is a one wire and working, you can and should carefully remove all the wires from the regulator that are still connected. cut them pretty short, and put shrink caps on them Or shrink tube and a touch of liquid tape to close the end. Some one wire alternators have access to the #1 terminal in the edge connector if it does and you test it with the engine off and ignition off, it should be a ground. Test by hooking the test light alligator clip to the big output stud on the alternator, and touching that spade terminal. If it lights the light, good so far. Start the tractor and run it up to 1/2 throttle. Then touch that same terminal#1 with the alligator attached as before. there should be no light (be careful to not touch anything but the terminal with the test light. (one way to make it easier is to attach a 1/4 spade terminal to a 2 piece of #12 wire, then strip the wire for 1/2 inch so you can touch it easily. Put that on the #1 terminal and test at the stripped end). The #1 terminal becomes a electrically hot terminal when charging. Because the terminal is hot, and the test light is connected to hot, the test light will have 12v on both leads and not light!. The test light is acting like a charge light on the dash. If you shut off the tractor, the light will light again. If this works, use the information below to attach a indicator light.
If none of this works, there may be no way to attach a dash warning light to that alternator. If it is a 3 wire alternator setup correctly the issue is more easily dealt with. The light in the dash needs to be an indicator light for 12v operation and have 2 leads (not a lead and a ground (which the original light might be.) The new light will be placed in series with the #1 terminal and the ignition key I terminal. So one of the dash indicator light terminals attaches to the #1 spade in the alternator, and the other gets 12v from the Key. (not the ignition coil because the ignition coil is fed electricity through a resistor wire from the key to the coil. Jim

For us to be able to help you you need to tell us things like what alternator you are trying to put on and did it have a generator or and alternator to start with. Lack of info makes it har for us to help you help your self

I always thought alternators did not need the use of a regulator as the generator did. So, installation of an alternator should of eliminated the need for a regulator. Could be wrong. But check your alternator out. See if whatever one you have, has a regulator already built in. If so, then you are obviously trying to run things through 2 regulators.

The early alternators had external regulators. Example is a 1969 Chevy pickup. they had an alternator and an external V.R.

the early GM alternators used the external regulator , like in 1964 to early 70's. after they had built in regulators. but i thought that the 606 used an alternator and it will have the separate regulator.

As they have said the first thing is to get the old regulator out of the system. Then to have your Amp light work as it should you need a 3 wire 10SI alternator, not a one wire self exciting unit. You then use the amp light to excite the 10SI. You will also need a wiring pigtail available at all auto parts stores. I buy them at Summit Racing. Alternator is about $35 and the pigtail is couple bucks.

There are wiring diagrams all over the internet for this, search Delco 10si wiring

lose the wiring to the old charging system.
If you don't know how to make your own wiring harness you may need to buy a wiring harness and wiring diagram.
I made my own wiring harness for Farmall and Jubilee.