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One wire alternator #179018 12/30/08 06:03 PM 12/30/08 06:03 PM
Joined: Jan 2003 Posts: 9,875 Weddington, N.C. Streetwize OP master
Streetwize OP master Joined: Jan 2003 Posts: 9,875 Weddington, N.C.	Hey guys, I replaced the GM 1 wire 70 amp on my Cobra Replica with a 100 amp unit i got from Summitt. The one thing I noticed with the old one is that sometimes the voltmeter would indicate 12V or sometimes less which told me (obviously) it wasn't putting a charge to the battery. The thing I found out is there is a minimum RPM the alternator needs to see before it switches on and because I had a small 6" crank pulley and a large 5" Alternator pulley, on a normal around town cruise that puppy would hardly put out at all. I went with a standard 2 1/2" pulley onthis one all I need to do is burp it one time and POW....14+ volts on the meter. I knew about this but since I don't need that extra 3HP from the big pulley I decided to move the 70A over to my Rocky. I run 3 electric fans onthe Cobra so there's a constant pull onthe battery it seemed to make the most sense to kill 2 birds with one stone. Just wantedto pass along that a 1 wire with underdriven pulley can sometimes cause more hassle then they're weorth. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: One wire alternator [Re: Streetwize] #179019 12/30/08 08:17 PM 12/30/08 08:17 PM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	i got the same 1 from summit! i wondered if it was even charging. i have a lot of draw with water pump,intercooler pump,fuel pump,fan,MSD al-2...i use 2 yellow top dry cell 700amp batteries just in case.

Re: One wire alternator [Re: blownzoom440] #179020 12/30/08 09:07 PM 12/30/08 09:07 PM
Joined: Sep 2003 Posts: 1,465 Carson City, NV B babarracuda pro stock
babarracuda pro stock B Joined: Sep 2003 Posts: 1,465 Carson City, NV	I bought a PowerMaster 1 wire Mopar alternator and it puts out 12.7 to 14V from 1200 RPM up.

Re: One wire alternator [Re: babarracuda] #179021 12/30/08 09:59 PM 12/30/08 09:59 PM
Joined: Jan 2003 Posts: 686 Houston, Texas F FastOrange mopar
FastOrange mopar F Joined: Jan 2003 Posts: 686 Houston, Texas	I have a Powermaster chevy 1 wire alt. I run the fans and water pump directly off of the alt instead of the batt.so the alt. internal regulator senses the voltage drop.

Re: One wire alternator [Re: Streetwize] #179022 12/30/08 11:19 PM 12/30/08 11:19 PM
Joined: Jan 2003 Posts: 18,418 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,418 UPPER MICHIGAN, MARQUETTE COUN...	Quote: Hey guys, I replaced the GM 1 wire 70 amp on my Cobra Replica with a 100 amp unit i got from Summitt. The one thing I noticed with the old one is that sometimes the voltmeter would indicate 12V or sometimes less which told me (obviously) it wasn't putting a charge to the battery. The thing I found out is there is a minimum RPM the alternator needs to see before it switches on and because I had a small 6" crank pulley and a large 5" Alternator pulley, on a normal around town cruise that puppy would hardly put out at all. I went with a standard 2 1/2" pulley onthis one all I need to do is burp it one time and POW....14+ volts on the meter. I knew about this but since I don't need that extra 3HP from the big pulley I decided to move the 70A over to my Rocky. I run 3 electric fans onthe Cobra so there's a constant pull onthe battery it seemed to make the most sense to kill 2 birds with one stone. Just wantedto pass along that a 1 wire with underdriven pulley can sometimes cause more hassle then they're weorth. We ran into the same problem. On a street car you need to overdrive the alternator aprox 3 times the crank speed for decent results.

Re: One wire alternator [Re: NITROUSN] #179023 12/30/08 11:23 PM 12/30/08 11:23 PM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Or get rid of the one wire and never look back.

Re: One wire alternator [Re: NITROUSN] #179024 12/31/08 05:37 AM 12/31/08 05:37 AM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	We ran into the same problem. On a street car you need to overdrive the alternator aprox 3 times the crank speed for decent results. that is on a street car with the OD.the race alts dont want to turn 20,000rpm.

Re: One wire alternator [Re: blownzoom440] #179025 12/31/08 10:19 AM 12/31/08 10:19 AM
Joined: Jan 2003 Posts: 18,418 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,418 UPPER MICHIGAN, MARQUETTE COUN...	Quote: We ran into the same problem. On a street car you need to overdrive the alternator aprox 3 times the crank speed for decent results. that is on a street car with the OD.the race alts dont want to turn 20,000rpm. The original poster was talking street car and thats what I was refering to.

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