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Old 05-05-2019, 08:36 AM   #1 (permalink)
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Default HELP...Alternator won't charge battery?

Ok my 87 Sami has the GM CS130-105 amp Alternator upgrade.

The fuse is new and fine, the battery is new and fine, the alternator is new tested and fine.

Plug to alternator has red wire to battery + side and black wire to the white/red stripe wire of the sami.

Why will the alternator not charge the battery?

Any advice?
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Old 05-05-2019, 02:20 PM   #2 (permalink)
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check wiring, Big terminal goes to battery and "S" terminal in the plug, "L" terminal goes to the charge lamp or ECU depending on vehicle its fitted to. If the dash lamp is blown then it won't charge, you may need to also jumper I and L together to get the regulator to activate, this must be via a lamp (charge lamp on dash) or an 85 ohm 5 watt resistor. electrical path for these connections is bat +ve, thru ign switch, thru lamp (or resistor) to L and I terminals.

Pic I have attached is the basic setup without the control feeds as described to make it work

S = sense voltage (senses battery volts to excite Alt)
I = Regulator ECU control via ign switch
L = Charge Lamp via ign switch
P = Rev Counter
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HELP...Alternator won't charge battery?-gm_cs130_plis-1.jpg  
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Old 05-05-2019, 04:15 PM   #3 (permalink)
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2013GV...Thank you.

What if the ECU has been deleted?
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Old 05-05-2019, 07:17 PM   #4 (permalink)
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Quote:
Originally Posted by csleger11 View Post
2013GV...Thank you.

What if the ECU has been deleted?
Don't worry, usually just join S to the big terminal which goes direct to the battery and take the "L" terminal to the ignition switch via a charge warning light

in rare cases depending on the regulator model you may need to join the I and L terminals together

The I terminal is there to allow the ECU to reduce the lad the alternator is applying to the engine when accelerating or is idling.
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2015 5 dr Grand Vitara 2.4 (daily driver)
1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
the 2013 3 dr GV is now the off road only toy

"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."
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