There's been alot of threads about the "Big 3" upgrade lately, which is a mod that I'd eventually like to do, but unfortunately funds and time don't allow for it right now (and probably not for a while). I don't have alot of electronics that need the extra current, just e-fans and an Infinity Basslink. Anyway, here's my idea...

Seems like the weak link in the factory set up is the small B+ fusible link from the red junction block to the alternator. I was thinking that a cheap, safe, factory looking upgrade would be to get a second B+ wire, and just double up on that wire. I'd have twice as much wire to decrease resistance and increase current, and still have the fusible link protection. I could cover the wire either in black wire loom or some large heat shrink for the factory look.

It couldn't hurt right? Any opinions?

Oh yea, I already have a 145amp alt BTW...

 

I would be cautious about it. I wouldn't think you would get the proper circuit protection with the 2 fuses in parallel.

 

2 fuses is parallel will require twice the amperage to blow.

Of course, I've been running 0 gauge from the alt directly to the battery with no fuse for over 2 years, so I'm not the one to be talking to about safety, lol.

 

I've been running 4ga from the alt to battery for several months now with no problems, but I just ordered an inline fuse to be on the safe side. One thing I would suggest is to also upgrade the ground wire. You can get a few feet of welding wire which shouldn't cost very much. Just suggesting because upgrading the power wire is really kind of pointless if the ground isn't adequate.

 

Excellent input, good points to consider

 

is this why at idle (stoplight) at night when I power up the widows and they hit the limit the lights dim even at 14.4 volts?

 

It probably won't solve that, but it should help some. I think the power window system is a poor design. Seems that most of these trucks use a ton of amps to operate the windows and they are plagued with relatively slow operation.

 

wouldnt having a fuse at all cause it to not be more than stock anyways.

 

Not sure I understand your question, but as I see it the goal isn't to be able to move more amps just to be able to supply the necessary amps more efficiently. So, a properly sized fuse is needed for safety to prevent damage to the system.

 

so on a 145 amp alt. you would need a 145 or 150 amp fuse