alternator ???
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alternator ???

  1. #1
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    Default alternator ???

    On a one wire mini alternator; in order to maintain a charge on the battery while motor is running; is it necessary to run a bigger pully on the crankshaft side & smaller on the alt side? currently im running 2 3/4" on both sides. Im continuing to have some charging issues. Battery is new as is alternator. Alternator is spinning at same speed as crank pulley. Am i missing somthing? Iv'e asked around however have got no solid answers wether this will or will not work. any opinions or knowledge would be appreciated.
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    Cantard 71hallett's Avatar
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    Quote Originally Posted by mares98 View Post
    On a one wire mini alternator; in order to maintain a charge on the battery while motor is running; is it necessary to run a bigger pully on the crankshaft side & smaller on the alt side? currently im running 2 3/4" on both sides. Im continuing to have some charging issues. Battery is new as is alternator. Alternator is spinning at same speed as crank pulley. Am i missing somthing? Iv'e asked around however have got no solid answers wether this will or will not work. any opinions or knowledge would be appreciated.
    With that size of alt pulley you are going to want about a 6" crank pulley.
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    Senior Member Futs's Avatar
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    Quote Originally Posted by mares98 View Post
    On a one wire mini alternator; in order to maintain a charge on the battery while motor is running; is it necessary to run a bigger pully on the crankshaft side & smaller on the alt side? currently im running 2 3/4" on both sides. Im continuing to have some charging issues. Battery is new as is alternator. Alternator is spinning at same speed as crank pulley. Am i missing somthing? Iv'e asked around however have got no solid answers wether this will or will not work. any opinions or knowledge would be appreciated.
    Im having the same issue. Its working but its not putting anything out.

    I ran a jumper wire from the feild the the power wire when im cruiseing the river and it puts out 15 volts, and then i unplug it after about 5/10 min running so i don't over charge.
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    this subject has been covered many many times on HB...every1 has a different opinon on what works...i personally run 2 batteries hooked to a Perko 3 way isolator switch...this allows me to use 1 battery for starting & 1 for assys...can chrg 1 or 2 with the flick of a switch...i also have an advantage over alot of people in that i run a "magneto" ...i learned a whole lot of years ago from drag raceing...so...i only need to spin the starter over & go with no issues about chrging! ...if everythings rite, it will start on a flashlite battery lol ...as far as pulleys go...i run a very small 1 on the crank & the normal 1 on the alt...n/p on chrging...just my .02 cents

    FastRat
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    I'm No Expert Shaun's Avatar
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    I use the jegs one wire 80amp alt, has a small pully on the front, and my crank pully is 6". One reason i bought this alt was because it energizes at a low rpm (900 rpm). I have had no issues with my setup and i run a MSD 6AL box.

    http://www.jegs.com/i/JEGS/555/10101/10002/-1

    Unless your running a ton of accessories or have a stereo that your playing all the time you dont need two batterys either.
    Last edited by Shaun; 08-06-2008 at 01:49 PM.
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    you've gotta run the smaller pulley on the alt., the alt turns almost twice the rpms as the crank, or should be anyways if your alt was made to turn on at 1500rpms, when runnin a 1 to 1 ratio on the pulley's, its gonna take 3000rpms to turn it on
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    Boat 502 76Miller's Avatar
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    At idle what should your volt meter read ? You aren't charging at idle, right ? So when your cruising down the river don't you want to see 14 volts on the gauge so you know your charging ? Now, I'm wondering if I have the same problem ?? I have a mini alt., not sure what size the pulley is, but the crankshaft pulley is 5 3/4''

    If you are overcharging would you pop the 30-amp re-setable breaker on the electr panel ?
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by 76Miller View Post
    At idle what should your volt meter read ? You aren't charging at idle, right ? So when your cruising down the river don't you want to see 14 volts on the gauge so you know your charging ? Now, I'm wondering if I have the same problem ?? I have a mini alt., not sure what size the pulley is, but the crankshaft pulley is 5 3/4''

    If you are overcharging would you pop the 30-amp re-setable breaker on the electr panel ?
    30 amp breaker between the alt and battery is wayyyyy to small if that's how your's is set-up, i'll either use some fuse link wire or a big 80-90amp fuse to protect my boat from a shorted alt.. on my tx i used a 90amp fuse , you can get them at most auto parts stores.
    your breaker shouldn't be in series with that 30amp breaker, something else is either drawing to much amperage or shorting to ground.
    Last edited by IMPATIENT 1; 08-06-2008 at 02:09 PM.
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    Senior Member Futs's Avatar
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    Quote Originally Posted by 76Miller View Post
    At idle what should your volt meter read ? You aren't charging at idle, right ? So when your cruising down the river don't you want to see 14 volts on the gauge so you know your charging ? Now, I'm wondering if I have the same problem ?? I have a mini alt., not sure what size the pulley is, but the crankshaft pulley is 5 3/4''

    If you are overcharging would you pop the 30-amp re-setable breaker on the electr panel ?
    You need to excite the field before it will charge and then it will charge untill the regulator says not to charge anymore. I like to see 13+ volts on the meter, but with my mini alt, it is not registering any volts, just showing battery volts until i plug the field excite wire to the power wire and it jumps up and shows a charge. I think i have something going on with my alt, but i have not had a chance to take it in and have it checked out. I bought it brand new and it has never acted like a 1 wire alt, but the people i bought it from swear it is....
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    Quote Originally Posted by Shaun View Post
    Unless your running a ton of accessories or have a stereo that your playing all the time you dont need two batterys either.
    i run lites 4 nite time use n a stereo n sometimes a flood/spot lite 4 fishing...thats y i have 2 batteries

    FastRat
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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    30 amp breaker between the alt and battery is wayyyyy to small if that's how your's is set-up, i'll either use some fuse link wire or a big 80-90amp fuse to protect my boat from a shorted alt.. on my tx i used a 90amp fuse , you can get them at most auto parts stores.
    your breaker shouldn't be in series with that 30amp breaker, something else is either drawing to much amperage or shorting to ground.
    The 30 amp breaker I'm running is very standard set up, its built into the electrical panel. Its not in series w/ the alt to the battery. Its been rigged the same way for 3yrs now with no problems, but it went bad on me last time out and the only change was the mini alt. Could be a bad connection somewhere or maybe the breaker just took a crap ?? Put a new one in and it fired right up. The question is...is it fixed or is it going to happen again ? I hate wiring !!
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    I run a Summit Racing 6.6 inch crank pulley with a Moroso alternator 5 inch pulley. Takes about 1200 rpm to put it on line, once on line it stays at 14v. My Alternator is a Motorola marine one wire.
    Upper Midwest Power Boat Association
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    Thanks for your input; will experiment with different size pulleys. should get it right; hopefully sooner then later.
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  16. #14
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    Mares turn the alternator 2:1. in other words smaller pulley on the alternator. We are turning an east coast electric mini alt. 21,000 Rpms (3:1) on one of our boats with no problems so far. They said it can handle the rpm and so far no problems. You dont want to turn it 1:1 you will not be happy with the results. If its a powermaster alt. keep an eye on it, they make JUNK parts, period.

    As far as charging goes (at 2:1) it should turn on just off idle, you can see this with a multimeter, I see it on my data logger very clearly.

    Good Luck.

    Chris.
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