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Discussion Starter · #1 ·
I ordered a new alternator for my 97 2 door Tahoe and it was different than the one I took out. A previous owner changed the plug and put a 200 amp alternator in. I also have a 94 2door diesel Blazer. The alternator in it matches the new one I bought. Also the alternator in the 94 is on the opposite side of the motor. Is this right? Are the serpentine belts different between a 94 and 97?
 

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I ordered a new alternator for my 97 2 door Tahoe and it was different than the one I took out. A previous owner changed the plug and put a 200 amp alternator in. I also have a 94 2door diesel Blazer. The alternator in it matches the new one I bought. Also the alternator in the 94 is on the opposite side of the motor. Is this right? Are the serpentine belts different between a 94 and 97?
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Along with the upgraded alternator, a set of 2/0 battery cables would go great and the Tahoe electrical system would thank you.
The Alternator and AC compressor switched sides when the OBD2 switch came into play.
Vehicles from 96'+ had their alternators and AC compressors swapped over to the other side to help accommodate things
 

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If the lettering on the belt still visible, you can see if they have the same number.
The number denotes the length.

As far as connector, you can always buy a pigtail matching the alternator and splice it.
As for the wiring, if you can post color, Glagulator can give you direction in less than a sec.
 

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Discussion Starter · #4 ·
I am replacing the alternator because I think it is draining my battery when the truck is off. What makes me suspect the alternator is the tachometer does not work. Does the alternator have to be designed to operate the alternator or will any alternator operate the tach?
 

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Your 94 should have a CS130 alternator, has external fan and a rectangular electrical connector, 4 pins with 2 wires.
Your 97 should have a CS130D alternator, has no external fan and an oval electrical connector, 4 pins with 2 wires.
Either truck could have an optional CS144 alternator, uses the same connector as the CS130.
Tach works the same with any of these alternators, I'm not sure about any others.
Thru 95 the tachs are calibrated for a 62mm alt. pulley.
1996-up they need the 57mm pulley, same as the gassers.
 
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Discussion Starter · #7 ·
Your 94 should have a CS130 alternator, has external fan and a rectangular electrical connector, 4 pins with 2 wires.
Your 97 should have a CS130D alternator, has no external fan and an oval electrical connector, 4 pins with 2 wires.
Either truck could have an optional CS144 alternator, uses the same connector as the CS130.
Tach works the same with any of these alternators, I'm not sure about any others.
Thru 95 the tachs are calibrated for a 62mm alt. pulley.
1996-up they need the 57mm pulley, same as the gassers.
Thanks Glagulator. The alternator someone put on this truck has a spade connector and a pigtail was spliced on the alternator wires to accommodate it.
 

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My CS 130D pigtail came with a resistor. Where does it go? The pigtail I ordered has two wires that engage with the 2 center pins in the alternator. My '94 pigtail pins line up with 2 pins on one side of the alternator pins. Crossing myfingers this works.
 

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You will need to move the terms like in the drawing.
You do not need a resistor.

Font Parallel Rectangle Number Diagram
 
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You probably will not find a 2 wire conn. that will work, except for the 4 wire conn.(cut off the not needed wires)
You can easily move the terms to the correct spaces on the one you have.
Like this - (that looks like your conn. but it is not the same, terms are the same)

 
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Finally, I know the name of that tool. Just ordered two different sizes. Been using tiny jeweler's screwdrivers for years. Thanks.
 
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When I did the alt modification, I need to buy the pigtail connectors with all 4 wires and cut the 2 unnecessary wires.
As Glagulator suggested.
 
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