What is the difference between 10SI and 12SI alternator?

What is the difference between 10SI and 12SI alternator?

Out back, a 12SI has much larger cooling vents than a 10SI, and a 10SI has more cooling vents than an older DN-series alternator. Besides having a higher amp output, SI-series alternators also begin charging at much lower engine rpm (which is beneficial when cruising, for example) than older-style alternators.

What does SI stand for in alternators?

Visual Identification and Differences. By Mark Hamilton. The “SI” in the model number stands for Systems Integrated, meaning that the voltage regulator is inside of the alternator. these alternators have a built-in voltage regulator. 10SI and 12SI are Delco Remy model number designations, but not part numbers.

How do you hook up a GM 1 wire alternator?

How to Install a 1-Wire GM Alternator

1. Disconnect the negative battery cable at the battery.
2. Mount the alternator to the engine.
3. Follow the battery positive cable from the battery to where it is connected on the starter relay.
4. Reconnect the negative battery cable to the battery.

What is a GM 10SI alternator?

The 10SI GM style alternators have a custom voltage regulator that lets the alternator be used as a 1-wire alternator or can be factory wired using the OEM plug. Available in a variety of finishes, these alternators output 100 or 140 amps. Every Tuff Stuff alternator is hand built and load tested in Cleveland, Ohio.

What does 12si mean on alternator?

The 12si was the upgrade to the 10si or 2nd generation. Higher amperage, more amps at idle, better cooling with the turbine fan. The housings were all metric threads. Amperage for 12si units were 56 amp 78 amps and 94 amps.

How do I know if my alternator is 10SI?

The amperage rating is found on the ID tag, and can be referenced by using the AC Delco part number. For example, the Delco part number “321-39” identifies a model 10SI with a 63 amp rating. Always use the AC Delco part number when referencing the alternator, or dealing with a parts or service department.

How many terminals does a GM 10si alternator have?

The GM 10SI Alternator All 10SI have three terminals (including those with a 1 wire regulator). The large BATT terminal which gets connected to your battery positive and a dual terminal connector. (available at any autoparts store) The 1 or R – Relay Terminal.

Can a CS alternator be interchanged with a 10si alternator?

Pulleys can be interchanged between the old externally regulated and the 10SI/12SI/CS-130, and even with the old externally regulated FORD alternators. Always use a voltage gauge to monitor your charging system. Don’t expect your alternator to do anything for you at idle speeds.

What kind of alternator does a GM tractor have?

Assembled with all original GM components, the model 10SI alternator had a . Delco Remy alternator, and so except for wiring, the up-grade is a “bolt-on. Basic wiring schematic with a GM 10Si alternator. From a Farm Tractor Web Site. Original Amphicar wiring schematic with a.

How many terminals does a CS alternator have?

The CS alternators are even better! All 10SI have three terminals (including those with a 1 wire regulator). The large BATT terminal which gets connected to your battery positive and a dual terminal connector. (available at any autoparts store) The 1 or R – Relay Terminal.