ls1 alternator, what to do about that stupid plug on it
ls1 alternator, what to do about that stupid plug on it theres a plug on the back of the ls1's alternator that if it is not plugged in, it will not work
i think it is called the "exiter" or something
what is the way around this?
i think it is called the "exiter" or something
what is the way around this?
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Are you swapping in the motor with the PCM and EFI or are you doing a carb swap? If your keeping the PCM what year is it and the wiring? The alternator is taken care of by the PCM on the 99 and newer. What is the alternator from f-body? Truck? Vette? Did you try the how to hook up an LS1 alternator link in the FAQ sticky post 13?
im just swapping in the pcm to run the engine thats it, im trying to run the connections that the jeeps alternator used to the ls1 alternator
alternator came off of an fbody, not sure what year though
alternator came off of an fbody, not sure what year though
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Since the alternator is for an f-body you only need to connect terminal B of the alternator. (Of course you will also have to connect the main charging wire that goes to the battery too.)
I don`t know if you can use the wires that are from the jeep alternator. Terminal B must be connected to some type of resistance source and then to IGN + 12V. So you would have to connect the alternator to a 1/2 watt 470 ohm resistor and the other side of the resistor to IGN +12V. Or If you want to use a lightbulb you would connect the alternator to one side of the light and the other side to a wire that is hot when the ignition is in the run position (IGN + 12V).
I don`t know if you can use the wires that are from the jeep alternator. Terminal B must be connected to some type of resistance source and then to IGN + 12V. So you would have to connect the alternator to a 1/2 watt 470 ohm resistor and the other side of the resistor to IGN +12V. Or If you want to use a lightbulb you would connect the alternator to one side of the light and the other side to a wire that is hot when the ignition is in the run position (IGN + 12V).
i ordered a pigtail plug that plugs into that port on the back of the alternator, it has 2 wires- a black and a red one
red wire would be 12v going out correct? idk what theblack would be
red wire would be 12v going out correct? idk what theblack would be
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Originally Posted by TXjeepTJ
i ordered a pigtail plug that plugs into that port on the back of the alternator, it has 2 wires- a black and a red one
red wire would be 12v going out correct? idk what theblack would be
red wire would be 12v going out correct? idk what theblack would be
The wire that you hook up does not go directly to 12V. If you connect the wire directly to 12V you will burn up the voltage regulator on the alternator, it MUST go through some sort of resistance, either a resistor or lighbulb.
Originally Posted by G-Body
It depends on what terminal the red wire goes to. You only need to hook up one wire (even though the connector has 4 pins). You need to hook up the wire that goes to pin B on the alternator.
The wire that you hook up does not go directly to 12V. If you connect the wire directly to 12V you will burn up the voltage regulator on the alternator, it MUST go through some sort of resistance, either a resistor or lighbulb.
The wire that you hook up does not go directly to 12V. If you connect the wire directly to 12V you will burn up the voltage regulator on the alternator, it MUST go through some sort of resistance, either a resistor or lighbulb.
ok, so when i get the pigtail, i just need to see which wire is going through the connector and touching pin B, i bought a 470ohm resistor to install in the wire that is going to the 12v source that is only on when the ignition is on
do i have everything correct?
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Originally Posted by G-Body
Yep, you have everything correct.
i only have one more question, im going to be using only one of the wires going into the plug on the alternator, what do i do about the other wire? cap it off and leave it?
thanks
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Yep, you can just abandon the other wire. Either wrap it with tape, or shrinkwrap the end, or you could remove it from the connector and fill the hole where it was with sealant.
Originally Posted by G-Body
Are you swapping in the motor with the PCM and EFI or are you doing a carb swap? If your keeping the PCM what year is it and the wiring? The alternator is taken care of by the PCM on the 99 and newer. What is the alternator from f-body? Truck? Vette? Did you try the how to hook up an LS1 alternator link in the FAQ sticky post 13?
Last edited by george88gta; May 4, 2007 at 05:26 PM.
hey G-body, i just tested one of the original wires that went to the jeeps alternator with an ohmeter and one wire showed to be giving out 6volts when the ignition was turned on, can i use this or does it have to be 12vlt
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Originally Posted by george88gta
I read thru the FAQ post you indicated and I noticed that you posted a question regarding the truck alternators and I could not find a response. Have you figured out what to do with the two wires (field duty cycle and indicator) that go to the truck alternator? This would be for a carbed LQ4, no PCM. The engine and alternator are from a 2002 Silverado 2500HD.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Originally Posted by TXjeepTJ
hey G-body, i just tested one of the original wires that went to the jeeps alternator with an ohmeter and one wire showed to be giving out 6volts when the ignition was turned on, can i use this or does it have to be 12vlt
Originally Posted by G-Body
I did end up figuring that out. Terminal B (indicator) goes to a resistance source just like the f-body alt. Terminal C (field duty cycle) goes directly to a 12V IGN + wire that is hot when the ignition is on.
Originally Posted by G-Body
I did end up figuring that out. Terminal B (indicator) goes to a resistance source just like the f-body alt. Terminal C (field duty cycle) goes directly to a 12V IGN + wire that is hot when the ignition is on.
Originally Posted by TXjeepTJ
wait, was i suppose to connect the 12v ign on to terminal C or B? i was told B and thats what i connected, i have an f-body alt.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Originally Posted by TXjeepTJ
wait, was i suppose to connect the 12v ign on to terminal C or B? i was told B and thats what i connected, i have an f-body alt.
The truck alternators require 2 wires, the second wire goes directly from IGN +12V to terminal C.
