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Wrangler JK and JL (2007 - Present) Technical forum for new-generation Jeep Wrangers. |
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#31
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Re: upgrading alternator wiring
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Failure is failure. |
#32
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Re: upgrading alternator wiring
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My comments on a 125 amp breaker/fuse being fine were based on the assumption that he doesn't actually need more than 125 amps out of his alternator... Because most people don't and unless you've upgraded the stock alternator, it's not capable of putting out more than that anyway. You can certainly argue that an individual needs more than 125 amps, in which case they need a bigger breaker/fuse, but most parts stores reman'd alternators barely make their rated current near max rpm, and at or near idle, where most people tend to run winches or jump start other cars, they're only capable of making a fraction of that, and once again the lower rated fuse is not going to cause a problem. I'm not saying I recommend putting a 125 amp breaker on a 160 amp alt, but it's not instantly going to trip, and is not going to hurt anything either. |
#33
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Re: upgrading alternator wiring
Some needs to tell power master to put "@ 100% load" on their alternator tags.
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#34
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Re: upgrading alternator wiring
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Here's some homework for you- You add up all the devices that are running on the average vehicle. Fuel pump, ignition, PCM, TCU, headlights, aux lights, AC, amp and radio, maybe a CB or other..........maybe a trailer, lights, Ebrakes, trailer battery,..........etc........Efan........wipers... .........whatever. Add it all up......typical summer evening.......running full tilt. Bet you'll be over 100 amps..........maybe 125 amps............continuous load. Your alt is running full load all the time |
#35
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Re: upgrading alternator wiring
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An alternator is not going to produce max amps all the time. Maybe you should quit embarrassing yourself and actually read on how charging systems actually work. Here let me help, https://www.lifewire.com/understandi...ratings-534785 Here is a vid that kind of shows it. If you look at idle its only putting out 50 amps until a load is applied, https://www.youtube.com/watch?v=Q3HKivSo_TY Last edited by Green XJ Jeep; July 21st, 2017 at 20:52. |
#36
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Re: upgrading alternator wiring
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In this case, your alt is UNDERcharging and yet the alt is at full tilt most of the time. Any extras on most of our Jeeps and we are drawing 100amps. Quote:
In this case, stop and go traffic...............your alt will never keep up. |
#37
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Re: upgrading alternator wiring
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At full load yes, sitting in the driveway warming up or idling in traffic with no auxiliary devices running it most definitely will not. |
#38
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Re: upgrading alternator wiring
You must have completely missed this,
Alternator Output Supply and Demand With all of that in mind, it’s also important to understand that the output of an alternator is tied to the demands of the electrical system in addition to its inherent capabilities and the speed that its input shaft is rotating at any given moment. In essence, while maximum alternator output is dependent on the rotational speed of the input shaft, the actual output is load-dependent. That basically means that an alternator will never generate more current than is called for by the momentary demands of the electrical system. What that means, in the real world, is that while an underpowered alternator can cause problems by not meeting the needs of your electrical system, a substantially overpowered alternator represents a lot of wasted potential. For instance, a high output alternator might be capable of putting out upwards of 300A, but it won’t actually provide more amperage than a stock 80A unit if that’s all the electrical system ever tries to draw. |
#39
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Re: upgrading alternator wiring
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No, my whole argument is you dont even know what demand is at any given moment. The argument began when the other posted stated that the OP would likely be OK with a 125 breaker and a 160 alt. My argument is that a 160 alt will put out 160, at some point, or, all day long, if demand is there, like jump starting another car/truck. A failing battery will cause a full load on the alt......whatever, whenever. |
#40
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Re: upgrading alternator wiring
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I too have added a 160 AMP alternator and if the fans are not running the AMP draw is less than 40. Now if throw in plenty of AMP gobbling equipment in the XJ the AMP draw will increase only these equipment are actually working and even so, the alternator will only deliver the amount of AMPS necessary to operate these equipment properly. For most of us it will be less than 100 AMPS. In my case I added another battery of more than 900 CCA's to help to smooth things out at start up. There is absolutely nothing wrong with a circuit breaker. They are the preferred electrical protector over a fuse in house AC and for the protection of critical implements that need to be on,...think of marine/boats, airplanes etc.. Keep in mind that breakers do go bad and trip prematurely unlike a fuse. Also, they could be bad right out of the box. The only disadvantage I see for a breaker in the XJ is the amount of space they need to mount them.
__________________
Patrick ![]() 1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries. |
#41
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Re: upgrading alternator wiring
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Of course the OP has now stated that he's not working on an XJ so specific loads beyond the XJ platform I can't really comment on... But you're way off base for an XJ. |
#42
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Re: upgrading alternator wiring
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In fact I know you are wrong, mainly because I do have an amp gauge, know how to work it and I can empirically prove you are wrong. Try again please. |
#43
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Re: upgrading alternator wiring
Alright then, F-ing do it.
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#44
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Re: upgrading alternator wiring
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Put some numbers down or STFU./ |
#45
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Re: upgrading alternator wiring
Clamp on amp gauge is gonna be here tomorrow... May take me a couple days but I'll post the actual numbers when I have them.
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