Stock alternator with winch ? (2 Viewers)

[pdugas]

Do I need to upgrade my alternator on my 82 FJ60 to run a 12,000 lb winch ?

 

[OSS]

Absolutely not.
The winch needs to cool down between short burst pulls. The stock alternator can easily keep up during the cooling periods.
I hooked up a regular hand held volt meter to the winch battery and mounted it in the cab so I could see the exact voltage during winching and resting. When the batt voltage dropped to a certain level I would stop winching and let the batt recharge & winch cool down.
In my experience its winch heat that's the limiting factor, not alternator size. You've got to wait quite a while for things to cool down between short pulls or you might pay the ultimate price.
I also mounted a small 12v fan next to the winch to help cool it faster.
I had 2 batteries hooked up in parallel.

 

[hj 60]

I have 24v so two batteries in serie and the winch is a big wack in voltage (like glow sytem and starting)
So when in use it drops to or below 12v (per battery, so 24v) and I rather leave the engine running but the alternator is a new old stock 25 amp so that thing does not do much.

Here is shows a bit how much amps are chewed when the winch has to work:
12V DC PERFORMANCE SPECS
Line Pull
Lbs.(Kgs.) Line Speed
FT./min(M/min.) Motor
Current Pull by layer
layer/Lbs(Kgs.)
0 30(9.14) 67 amps 1/12000(5443)
2000(910) 14(4.27) 140 amps 2/11120(5044)
4000(1810) 8.62(2.63) 210 amps 3/10340(4690)
6000(2720) 6.92(2.11) 250 amps 4/9770(4432)
8000(3630) 5.80(1.77) 320 amps 5/9250(4196)
10000(4540) 4.39(1.34) 370 amps
12000(5440) 3.86(1.18) 440 amps

24V DC PERFORMANCE SPECS
Line Pull
Lbs.(Kgs.) Line Speed
FT./min(M/min.) Motor
Current Pull by layer
layer/Lbs(Kgs.)
0 31.94(9.57) 24 amps 1/12000(5443)
2000(910) 11.7(3.57) 105 amps 2/11120(5044)
4000(1810) 9.5(2.90) 129 amps 3/10340(4690)
6000(2720) 8.5(2.59) 152 amps 4/9770(4432)
8000(3630) 7.5(2.29) 175 amps 5/9250(4196)
10000(4540) 6.5(1.98) 198 amps
12000(5440) 6.0(1.83) 221 amps

Above performance specs are based on first layer of drum

don't use the old solenoids (can go sticky, add power cut off key)
Albright Contactor - Extra Duty is safe

Below dash voltage is not heavy use, but it tries to destroy the battery and you also want to start later.
A 12-volt battery typically operates within a voltage range of 12.0 to 12.8 volts when fully charged and can be considered fully depleted when it falls below 11.8 volts.

1. Voltage range when fully charged: 12.6 to 12.8 volts
2. Voltage range for normal operation: 12.0 to 12.5 volts
3. Voltage level indicating discharge: Below 12.0 volts
4. Critical undervoltage threshold: 11.8 volts
5. Risks of operating below critical threshold: Battery damage and reduced lifespan