What is difference between 10SI and 12SI alternator?

What is 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 mean for alternator?

The “SI” in the model number stands for Systems Integrated, meaning that the voltage regulator is inside of the alternator.

Are all GM alternators the same?

No. Not all GM alternators are alike. Corvettes have smaller crankshaft pulley’s so the alternators turn slower… A Chevy alternator may look the same and most rebuilders list them the same.

How do I identify my GM alternator?

Two of the most commonly used models were the 10SI and 12SI alternators. Two key identification points of the SI alternator is the external fan with V belt pulley and the 2 charge indicator light terminals (male blades) that appear on the backside of the alternator.

How do you size an alternator?

As a rule of thumb, 12-volt alternators use one horsepower for every 25 amps of output, or to put it another way, their ratio of output to horsepower load is 25:1. So, when selecting a new alternator, you need to size it for the limits of the capacity of its drive belt.

How many amps is a GM alternator?

The older GM 10Si and 12Si alternators have limited capacity especially if you’re planning lots of accessories. In stock form, the most you can expect from these old dynamos is 90-100 amps. The good news is PowerMaster Performance offers 10Si and 12Si high output clones that make as high as 140 amps.

What does F mean on an alternator?

B terminal – Main alternator output terminal (connected to the battery) F terminal – Full-field bypass for regulator.

What is R terminal on alternator?

The “R” terminal or Relay terminal as it is sometimes called, provided some of the alternator’s output and was used to power electric tachometers, a dash light, hour meters, or other modern accessories. In some applications it was connected to the dash light to give notice if the alternator was failing to charge.

Is higher amp alternator better?

That is, your alternator will only supply the amount of amperage a particular component demands—and no more. So high-output alternators will not harm your components or charging system, no matter how high you go with the amps.

Will a bigger alternator hurt my car?

Is a 160 amp alternator good?

The 160 amp is known to be used on emergency vehicles that are at a standstill and still running lots of 12v power thru said appliances.

Is it OK to use a higher amp alternator?

You can never have too much amperage when it comes to alternators; therefore, you never have to worry about choosing an alternator with too high of a rated output. Here’s why: Amperage is basically the amount of electrical current your alternator can supply. And it basically operates off of supply and demand.

What size alternator do I need for a 3000 watt amp?

3000 watt / 12V is equal to 250A. A 250A alternator is needed to keep up with it. Since your engine would have to work just as hard as any portable 3KW generator to keep up with the amplifier, you would need a large fuel tank.

What is B on an alternator?

What is C on alternator?

C: (Computer Controlled) This terminal is an input signal from the ECU which controls the charge rate. This signal will tell the alternator when to stop/start charging. This terminal can be tested by connecting into ground and the Voltage Set Point (VSP) should show a voltage of around 12.8V.

What does the R stand for on an alternator?

What size alternator do I need for 1000 watt amp?

If you’ve read this far and are starting to rethink 150’s, hair tricks, and broken windshields, you can still enjoy considerable bass with a single high output alternator in your car or truck. As a general rule, you need about 100 amps of current for every 1000 watts of power generated.