crawler 40 alternator

kevencyr · Post by **kevencyr** » Wed Dec 16, 2015 10:09 am

hey guys, i got a 40c with an electric winch on it, notice that i have to have my crawler almost at full throttle to keep battery charge to make winch working. somebody told me i could installed an alternator that would charge at low idle. he mention a 65 amp chevy and was talking about maybe some plugin to buy on the side. also, i'm already on 12 volts system. any other idea or this one sound right. thanks

Stan Disbrow · Post by **Stan Disbrow** » Wed Dec 16, 2015 10:25 am

Hi,

Sounds like he was talking alternator and regulator (the thing which plugs in). Most go for a 1-wire alternator when switching. Makes life much easier. Either way, you will have to fabricate some attachment bracketing. Alternators do not have the same form factor as generators do.

But, yes. An alternator will put out more power at lower RPMs.

Stan

jtrichard · Post by **jtrichard** » Wed Dec 16, 2015 10:53 am

Sounds like you have a 1 wire set up they have to be at a high RPM to charge ... you need to go to a 3 wire internal or external regulator set up they start charging at low RPM

Stan Disbrow · Post by **Stan Disbrow** » Wed Dec 16, 2015 12:40 pm

Hi,

It isn't the 1-wire, per se, that makes any given alternator want a given amount of RPMs to produce a given output. It is the winding ratio of the stator vs the rotor coupled with the pulley ratios.

Perhaps the suggested alternator model is one his friend has figured out will be a better choice for where it will be used....

Anyway, the same electrical bits in the outboard regulator are there in the 1-wire. Just incorporated inside the case.

And, for some reason, I was thinking the OP might have a 12v generator since the original 6v to 12v conversions used generators which were a physical match. Not common now, of course. And he didn't say of course.

Stan

jtrichard · Post by **jtrichard** » Wed Dec 16, 2015 12:54 pm

I was not thinking 12v gen Good catch STAN ......

kevencyr · Post by **kevencyr** » Wed Dec 16, 2015 3:38 pm

so just check, look like a normal 12 volts alternator from a car. got 2 wires plug into it. the winch that i got is a 11500 lbs, electrical. it's draining my battery every time i use it, if i put mu crawler at full rpm, its fine. was just wandering if someone would know if a 65 amp High Output Alternators would be fine or should i go bigger. thanks

Post by **Lavoy** » Wed Dec 16, 2015 4:24 pm

The only alternator that will keep up to that winch would be PTO driven. A winch of that size will pull upwards of 400 amps at full load, there is nothing of any significance that you can put on there in the way of alternator to even make a dent in the electrical demand if you are using it for any time period.
Lavoy

kevencyr · Post by **kevencyr** » Wed Dec 16, 2015 6:04 pm

well, that not good news, so what your saying is that even if i put a 100 amp, i'm wasting my money. would an extra battery works. when you say pto driven, is there any example. picture. thanks

jtrichard · Post by **jtrichard** » Wed Dec 16, 2015 6:20 pm

YES more battery's in parallel would work and allow more winch time .....highest amp alt. that you can mount on you brackets would also help ... any pics of your winch/winch data plate and the alt?

Post by **Lavoy** » Wed Dec 16, 2015 6:48 pm

Sorry, I was referencing something like a 12 KW PTO alternator as a joke. I would question whether you could get 100 amps out of a 100 amp alternator due to lower RPM of the alternator. 420 just does not have a large enough pulley, and does not run at a high enough RPM to get full output would be my guess. More batteries will be better, but still have to pay the fiddler somehow, so likely have to wait for a while after a long winching to get power back. I would probably look at deep cycle batteries as well if you are going to be discharging and charging that much.
Lavoy

kevencyr · Post by **kevencyr** » Wed Dec 16, 2015 6:49 pm

TRAVELLER 12V TRUCK ELECTRIC WINCH, 10,000 LB. CAPACITY
will draw 360 amp at 10 000 and 290 amp at 7000 lbs. my alternator is just old, no info. the bracket can be modified, i just don;t want to pay 700 $ for a 370 amp at mechman if it not gonna work

kevencyr · Post by **kevencyr** » Wed Dec 16, 2015 6:53 pm

yea, i saw the picture after Lavoy, those are some machine. anyway, thanks for the info, that what i taught too with the idle to low, but just trying too find a solution somehow. still wandering how does the pick-up truck managed that kind of amp draw.

Stan Disbrow · Post by **Stan Disbrow** » Thu Dec 17, 2015 4:46 am

Hi,

A big, fat, cable from the battery. They all get their power from the starting battery. The winch motor is quite like the engine starter.

You might mount a second battery as close to the winch as possible. Keep the cable run as short as you can. Use number 2 wire from the 2nd battery to the winch. Run two cables, pos and neg, to the winch itself. High current means high cable loss, and copper has less loss than the steel of the machine and frames.

I would also run a number 4 cable from the engine starting battery to the winch battery. Yes, there will be some loss there when running the winch, but it will help.

The output issue with the alternator you have is the pulley on the engine is too small a diameter vs the alternator pulley. But...you really can't make that larger - or the alt pulley smaller - to increase the alt shaft speed. I suspect you will have the same issue no matter what alt you use.

A second battery will help you more. And if you winch too much, it will slow down and you will have to wait for the alt to catch it back up.

Stan

kevencyr · Post by **kevencyr** » Thu Dec 17, 2015 5:43 am

ok thanks for the help, want waist my money and yes it does make sense about the pulley. i will try that, otherwise, might go with a warn hydraulic winch, expensive but would work.

kevencyr · Post by **kevencyr** » Thu Dec 17, 2015 5:44 am

hey Stan, would you know how i could tell if my crawler 420 should be yellow or green. all i know its the phase 2 production, but now it yellow. if i removed some parts i see green.

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