Author Topic: gm 1 wire alternator?  (Read 13547 times)

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locked 4x4

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gm 1 wire alternator?
« on: Aug 23, 2010, 08:39:35 PM »
So I have a 1982 Toyota pickup and my stock alternator isn't putting out enough amps to run my stereo lights heater etc at the same time.  I would like to upgrade to a 100 amp or better alternator and I was thinking about running a gm alternator and doing the 1 wire set up.  From what I understand the alternator do sent kick on until it hits 3000 rpm's with the 1 wire set up.  I am worried that this is going to be a problem when I am crawling along slow at low rpm's.  Has anyone had any experience with this swap?  Also does anyone know how I could get the alternator to charge at a lower rpm?  Thanks in advance for the help.

possume22

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Re: gm 1 wire alternator?
« Reply #1 on: Aug 23, 2010, 09:12:46 PM »
it should charge at a idle but instead of the gm swap i just did the internally regulated toyota alt swap but it isnt 100 amps what is pulling so many amps you have lots of extra lights or something

locked 4x4 [OP]

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Re: gm 1 wire alternator?
« Reply #2 on: Aug 24, 2010, 09:32:55 AM »
Yea I have lights, stereo, heater, ect.   I like to do night wheeling and its happened before where I get out of my truck to help someone or something and I leave it running and I get back in the truck, it stalls or something and the battery is dead.  From what I understand though if the alternator isn't turning at least 3000 rpm's it wont be charging.  If my truck is idling around 800-1000 rpm's I feel that it wont quite be enough to get the alternator up to 3000.  Im just trying to see if there are any other options out their to get a high output alternator that will charge at low rpm's.

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Re: gm 1 wire alternator?
« Reply #3 on: Aug 24, 2010, 12:46:17 PM »
the gm 1 wire alts charge under 3k rpm, they may not have peak output in the lower rpms however.... some just wont get exited untill a higher rpm to start charging...

there is lots of info on the gm 1 wire online.....i dont got the time to find it

but also try

http://www.4x4wire.com/toyota/tech/alternator/
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Re: gm 1 wire alternator?
« Reply #4 on: Aug 24, 2010, 01:12:47 PM »
I used a GM 1 sensing wire 105 amp alternator out of mid 1990s Chevy truck & it put out around 40 + amps at idle measured by a DC amp clamp meter. No more drained battery after a night run to coyote lake.
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79toy20r

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Re: gm 1 wire alternator?
« Reply #5 on: Aug 31, 2010, 11:09:56 PM »
I'm running one out of an early 80s suburban. It doesn't get excited until about 2500 rpm, but once it's excited it holds 13.8 volts at idle with an e-fan and headlights on. And 14.2 at around 2k rpm. You can also get a 3 wire gm alternator. Just a little more work to install

locked 4x4 [OP]

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Re: gm 1 wire alternator?
« Reply #6 on: Sep 05, 2010, 01:56:14 PM »
What needs to be done to install the 3 wire gm alternator.   Ive been searching around for instructions on how to do it but haven't found anything I feel comfortable with.

OOPS

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Re: gm 1 wire alternator?
« Reply #7 on: Sep 05, 2010, 04:16:01 PM »
What needs to be done to install the 3 wire gm alternator.   Ive been searching around for instructions on how to do it but haven't found anything I feel comfortable with.
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Re: gm 1 wire alternator?
« Reply #8 on: Sep 05, 2010, 08:00:54 PM »
http://www.pirate4x4.com/forum/showthread.php?t=458156&highlight=OOP%27S

definatly the way to go. i did a gm swap although i just went to napa and found an alt that fit my needs, at idle its at almost 14 volts.
theres another mod i've done that helps when you leave your truck and need to charge it. the link is in my sig
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Re: gm 1 wire alternator?
« Reply #9 on: Sep 06, 2010, 08:49:47 PM »
I use a gm 140 amp alternator on my 81 with the trail gear's gm to toyota bracket and it works good have stereo system and lights ac and power inverter with dual battery setup and it works great and my gauge it reads 13 to 12 volts with everything on you should try that check it out. http://board.marlincrawler.com/index.php?topic=72265.0;highlight=81+slow+build
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locked 4x4 [OP]

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Re: gm 1 wire alternator?
« Reply #10 on: Sep 06, 2010, 09:38:03 PM »
Thanks for all the help everyone.  This is awsome. 

 
 
 
 
 

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