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$200 K5 (454 K5 now) *too much junk in the trunk

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I have never understood the alternator circuits, just managed to keep them working. Right now its got the pink wire in the 2 prong plug hooked up but the brown wire is cut and it still charges. The charging lug is hooked to the battery and a 2nd wire with the fusible link is hooked to the fuse block.
 
mrk5 said:
I will charge? I thought it wasn't.
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Yes, it has always charged right and will charge with the cluster out. Has a drain and hum when you shut the engine off and have the cluster unhooked.
 
When I unplug the 2 prong connector from the alternator it stops humming but also will not charge. Cluster unplugged. Its the exciter circuit, i just cant figure out how it works.
 
Do you have a CS130 style alternator?

This answers your question, you need a light bulb or resistor in there, I just used a resistor, because I have a Voltmeter, so I don't need the warning light.

CS130.JPG
 

Attachments

  • Delco CS130 Alternator Info.pdf
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folkenheath said:
Do you have a CS130 style alternator?

This answers your question, you need a light bulb or resistor in there, I just used a resistor, because I have a Voltmeter, so I don't need the warning light.

View attachment 463373
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bp71k5 said:
I was going to second that. I just used a big resistor as well.
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How big of a resistor did you guys use? I have a bunch of random electronics ones.
 
What's this alternator?
IMG_20231229_140400478.jpg
IMG_20231229_140437297.jpg
2 prong plug, 1 charge lug on back, serpentine. Can't remember if it came on the 1990 Blazer or a 1992ish big block K3500 that I pulled the BBC accessory drive off.
 
Looks like they came in left mount, straight mount and right mount. Internet pictures were throwing me off. I kept finding the straight mount pictures.
 
CS130 SBC truck alt. Regulator plug is actually a 4 prong. It will be labeled P L I S Stator, Lamp, Ignition, and Sense. The L terminal can be hooked up to a resistor, or an idiot light. The easiest way is to hook a switched 12v signal to the Ignition terminal, and call it good.
 
500$k5 said:
Straight mount, is be for the 454. What you have is the 350 one.
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That explains why the belt from the big block accessory drive was too big. I have a small block alt in a big block bracket.

The plug is only 2 wire, a pink going to the dash and a brown that is unhooked.
 
500$k5 said:
CS130 SBC truck alt. Regulator plug is actually a 4 prong. It will be labeled P L I S Stator, Lamp, Ignition, and Sense. The L terminal can be hooked up to a resistor, or an idiot light. The easiest way is to hook a switched 12v signal to the Ignition terminal, and call it good.
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I will see if I can find the letter markings tonight. If I can hook the I terminal to switched power (the pink I am using for the pro flo switched power) that would be great. It would be nice to not have to buy a different alternator. I was working on it again this afternoon and just getting discouraged.
 
No new alt needed. If you look at the diagram that @folkenheath posted, you will see that the alt is marked P L F S. It actually has a Ign. terminal, instead of an F terminal. Gm didn't mark all of them the correct way. Some of them have a F, and an I marked with both. The GM trucks used the I terminal, where some FWD cars used the F terminal. Just hook your pink wire to the I, or F, which ever one they decided to mark it with.
 
Don't know why it posted 2 pics, but oh well. This alt is marked with both, but being a truck alt, it is an I terminal.
 
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