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Re: Re: H 12v alternator?
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Posted by Doug in OR on February 13, 2004 at 21:49:14 from (67.166.95.121):
In Reply to: Re: H 12v alternator? posted by Bob M on February 13, 2004 at 18:51:04:
Most alternators follow a similar wiring scheme. Below is a short list of the terminals, and what they mean. BAT: This is the main battery terminal. It is the same on all alternators. The Delco 10SI, the Delco 121/130 series, the Nippondenso alternators.. Hitachi.. etc. S: The sense terminal. This is pin 2 on the 10SI. Connect this either to your battery, or the alternator BAT stud. On the Delco 121/130 series alternators, this terminal will usually be under the rubber packing. You need not connect it on the 121/130 Delco - this alternator uses internal sensing. I break out this terminal and use it only when I am using two batteries and a battery isolator. I: The exciter (ignition) terminal. This is pin 1 on the 10SI. Connect it to your ignition switch. You may or may not need a diode, depending on the alternator. On the 10SI, you can use a diode or lamp configuration. L: The indicator lamp. You don't need to use this terminal. Attach a warning lamp here, as you would on a 10SI, if you wish. This is a quick and dirty run down of the various terminals. There's really not much difference between one alternator or the other. The 10SI is the most popular because of the price. I suspect that the Delco 121 or 130 alternators should be inexpensive too - they started using them in about '85, right after the discontinued the 10SI. I don't know the physical size of the 121, but it might be smaller than the 10SI. I know for certain that a Nippondenso for an old mid-80s Toyota will be smaller.
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