PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

What does this wire do?

Old Sep 5, 2005 | 01:10 PM
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Default What does this wire do?

Well i re-did the engine and now it wont start, all is hooked up except the little red wire that hooks to the top of the alternator, it has a 4 port connector but only 1 pin is used what does this do? And also my gauges dont seem to work either.
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Old Sep 5, 2005 | 05:33 PM
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Sound like you battery voltage circuit is open. Connect that little red wire, then try again. Does any electrical accessories work at all?
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Old Sep 5, 2005 | 05:53 PM
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Yeah that's the L terminal wire that gives feedback to the PCM and the car will not start without that tiny little wire connected. Kinda scary huh?

I would support that wire to prevent vibration breaks later on down the road.
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Old Sep 5, 2005 | 07:38 PM
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Originally Posted by TXCAMSS
Yeah that's the L terminal wire that gives feedback to the PCM and the car will not start without that tiny little wire connected. Kinda scary huh?

I would support that wire to prevent vibration breaks later on down the road.
My 98 would start without it, but the alternator would not charge at all.
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Old Sep 5, 2005 | 07:54 PM
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That's strange. I disconnected mine and tried to start the car, but would just spin over with no desire to fire off. Once I reconnected it, she fired off immediately. My car is an 01 SS though. Maybe there's a difference between the different year models.
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Old Sep 5, 2005 | 08:53 PM
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Originally Posted by felton316
My 98 would start without it, but the alternator would not charge at all.

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Old Sep 6, 2005 | 08:35 AM
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ok well ill get that thing connected and see what happens, as far as other electrical acces. they all seem to work just no fire in the engine.
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Old Sep 24, 2005 | 04:50 PM
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I just got done installing a '98 LS1 in my GTA and it's running but the alternator isn't charging. I also have the 1 wire connector (1 wire). Right now it's hooked up to my 3rd gen wire to feed my gage in the dash. Does this need to be hooked back up to the stock LS1 harness? Should it have 12V with key on or what??



thanks!
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Old Sep 24, 2005 | 06:47 PM
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Default L terminal wire

This is how it is on 99+. I could not find it used on the 98 PCM pinout diagram. Do not connect L directly to + 12 volts- you can burn out the regulator. Anyone with 98 info?
Attached Thumbnails What does this wire do?-cs130d.png  

Last edited by barito48; Sep 24, 2005 at 06:56 PM.
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