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  #1  
Old July 19th, 2017, 11:42
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Kejtar Kejtar is offline
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upgrading alternator wiring

so..... lets look at a scenario of a 160amp alternator and about 8 or 10 gauge wire from alternator to battery. If I go with the 8 gauge theory (I'm eyeballing it) that means that I really get at most 73 amps through it (give or take - depending which chart you use).

There are couple options now ahead of me - either replace the whole wire (PITA) or add another in parallel (more appealing). Now lets assume that the stock wire has a fusible link buried someplace in there....

So if I go the simpler route and if I run a 2 gauge in parallel the question is should I put a fusible link or a circuit breaker on it?
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  #2  
Old July 19th, 2017, 12:16
trippled trippled is offline
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Re: upgrading alternator wiring

Why not just remove the factory wire and run a large cable? I ran mine to a audio ANL fuse holder then to the battery. Simple and works fine.
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  #3  
Old July 19th, 2017, 12:24
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Kejtar Kejtar is offline
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Re: upgrading alternator wiring

Ok so let's say that I do pull the stock wire... again question stands - fusible link or a circuit breaker?
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  #4  
Old July 19th, 2017, 16:59
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Hypoid Hypoid is offline
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Re: upgrading alternator wiring

Quote:
Originally Posted by Kejtar View Post
Ok so let's say that I do pull the stock wire... again question stands - fusible link or a circuit breaker?
Fuse, preferably a "slow blow" fuse.
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  #5  
Old July 19th, 2017, 17:32
Jeep Driver Jeep Driver is offline
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Re: upgrading alternator wiring

4g wire and a 175amp Mega fuse.
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  #6  
Old July 19th, 2017, 18:39
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Re: upgrading alternator wiring

What about something like this? In appropriate amperage of course

https://powerwerx.com/resettable-cir...EaAhCLEALw_wcB
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Old July 19th, 2017, 19:03
Jeep Driver Jeep Driver is offline
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Re: upgrading alternator wiring

Quote:
Originally Posted by Kejtar View Post
What about something like this? In appropriate amperage of course

https://powerwerx.com/resettable-cir...EaAhCLEALw_wcB
You need to be beyond your amp output...............175 at least, if not 200.

Megafuses are $5
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  #8  
Old July 19th, 2017, 19:19
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Re: upgrading alternator wiring

Size of the fuse is debatable as with a 6 foot run of 4awg 120 amps is probably where I will be happy. Also I do not expect the draw to ever come close to the max.... Hell.... Currently I am at the fraction of that due to factory wire size limitation...
Anyways the question is... Can I use that circuit breaker and what is the pro/con of it over the fuse/fusible link
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Old July 19th, 2017, 19:27
Jeep Driver Jeep Driver is offline
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Re: upgrading alternator wiring

Quote:
Originally Posted by Kejtar View Post
Size of the fuse is debatable as with a 6 foot run of 4awg 120 amps is probably where I will be happy. Also I do not expect the draw to ever come close to the max.... Hell.... Currently I am at the fraction of that due to factory wire size limitation...
Anyways the question is... Can I use that circuit breaker and what is the pro/con of it over the fuse/fusible link
This has nothing to do with draw, has to do with output.

If you have a 160amp alt, it WILL put out 160 amps.

You are protecting the entire electrical system from the alt........again, nothing to do with draw.


Best you will have is 18" of 4g wire from the alt to the battery/starter relay/PDC.


No, I would not use, did not use, a breaker.
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  #10  
Old July 19th, 2017, 19:37
Jeep Driver Jeep Driver is offline
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Re: upgrading alternator wiring





This is what a properly wired high output alt will look like.



If you use a 150amp breaker with a 160amp alt, you will be constantly resetting the breaker..........you need to be beyond 160amp. IIRC, 200amp breakers, good ones, get expensive.
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  #11  
Old July 19th, 2017, 19:50
Jeep Driver Jeep Driver is offline
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Re: upgrading alternator wiring

This is how you attach a Megafuse, red cable runs to alt. It's that simple.

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  #12  
Old July 19th, 2017, 22:36
Heavyopp Heavyopp is offline
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Re: upgrading alternator wiring

I have a spare 100 ft roll of 1/0 welding cable -- think I'm gonna use that to rewire my 160 amp alternator -- also thinking about doing the line to the starter -- and an aux line to the rear for "house" power

How reliable are those mega fuses? Ever blow one?
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  #13  
Old July 19th, 2017, 23:18
XJwonders XJwonders is offline
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Re: upgrading alternator wiring

I would trust megafuse over anl fuse. Those anl fuseholders Re a joke compared to a mega fuse holders.
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  #14  
Old July 20th, 2017, 05:55
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Re: upgrading alternator wiring

Quote:
Originally Posted by Heavyopp View Post
I have a spare 100 ft roll of 1/0 welding cable -- think I'm gonna use that to rewire my 160 amp alternator -- also thinking about doing the line to the starter -- and an aux line to the rear for "house" power

How reliable are those mega fuses? Ever blow one?
Megafuse is standard on Ford trucks.

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  #15  
Old July 20th, 2017, 06:55
SBpunk SBpunk is offline
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Re: upgrading alternator wiring

Got this from MeanLemons. He does upgraded cables on the venders section
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