93-98 T100s All T100 trucks

Battery/Alternator light coming on

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Old Mar 30, 2013 | 05:10 PM
  #21  
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From: Summit County Colorado
on that S teminal wire where its suppose to go to a fuse i do not have a fuse there just connected to some wires that go into the fuse box
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Old Mar 30, 2013 | 06:01 PM
  #22  
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From: Northen Indiana
nice writeup...
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Old Mar 30, 2013 | 06:20 PM
  #23  
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Oh Yeah, "S"; I just need new reading glasses - LOL!

Originally Posted by cccp
and i do believe that is an S on the wiring diagram just smudged up or something
Oh yeah, just my reading glasses failing me That's why original pdf of schematics work best.

Originally Posted by cccp
on that S teminal wire where its suppose to go to a fuse i do not have a fuse there just connected to some wires that go into the fuse box
Should connect to 40A fuse. However, not critical. All "S" does is measure battery voltage and send it back to regulator so latter can change stator to compensate.

Originally Posted by bone collector
nice writeup...
Thank you! The least I can do to give back to the community that helped me find Ruby Tuesday
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Old Apr 4, 2013 | 11:50 AM
  #24  
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Sorry for long reply just been so busy but finally have a chance to work on my truck with ea1 connector disconnected the light is off but my engine will not start with it disconnected checking all wiring now
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Old Apr 6, 2013 | 08:59 AM
  #25  
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Well after digging around i thought it was alternator that went bad. Got a lifetime warranty one from autozone. Installed the new alternator and hooked everything up like it was. When i first turned on my ignition the battery light did not appear on the dash, after starting it the light was off and the alternator was not charging. I had it hooked up on the isolator. Than i hooked it B terminal on alternator straight to the battery. The battery light apperared on the dash was did not light up. I than dug through all the wiring again and what i believe happened was on the "IG" terminal there was a wired spliced into it that goes onto the delcotron connection on the isolator. I believe that connection was bad. I than fixed the problem with some butt connectors ( temp fix for now until i solder the wires) Hooked everything up even with second battery everything was charging and no battery light on. Could not dig up anything else so hopefully that was it
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Old Apr 6, 2013 | 09:00 AM
  #26  
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thanks for the help rad4runner
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Old Apr 6, 2013 | 05:34 PM
  #27  
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Good to know it works now!

Originally Posted by cccp
... what i believe happened was on the "IG" terminal there was a wired spliced into it that goes onto the delcotron connection on the isolator. I believe that connection was bad. I than fixed the problem with some butt connectors ( temp fix for now until i solder the wires) Hooked everything up even with second battery everything was charging and no battery light on. Could not dig up anything else so hopefully that was it
Cool! Most welcome. Makes sense, because the IG terminal is what gives the alternator, its field current. No field current means nothing generated, like no yeast = no beer

Isolator must be using IG voltage from IG fuse to tell it that engine's on.

Hope that's it.
Regards,
RAD
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