I'm wanting to install a JS high output alternator and it says I need a serpentine belt that's a 1/2 inch shorter die to the smaller pulley. Does anyone know where to find a smaller belt? You'd think all these high output alternator websites would sell them or have links to where you can buy them.
. Also want a second opinion on whether or not I even need one. I have a Skar audio skv2 1500.1 amp pushing 2 Skar 12s at 1200 RMS. I have a new die hard platinum battery. I still need to do the big 3. I think the big 3 will be enough. Maybe put a new stock alternator and the big 3. I also rarely drive the car. Has the original alternator at 105,000 miles.

 

I put a 270A DC Power Inc alt on my 2014 motor. No change in belt size required. You can search for whatever belt you want on any of the manufacturers websites, they all have tools to do so.

You can never have too much electric, but you can certainly have not enough.

 

So you need to decide whether or not you want to do it, then commit, because unless you can find someone else with a 7th gen and a JS alt and a part number for you, you're going to have to install the alt, run your string around the pulleys, measure, and search for a belt that is whatever the length you measured was. Keep in mind the range of motion of your auto-tensioner. It is marked on the body. Make sure you measure your belt length at the upper limit of the tensioner range.

 

Would you happen to know what’s the amperage output of the stock factory alt ?

 

130 amp

 

I just looked up dc power and no alternator for an 09 maxima. I'm good with 2 batteries. I've done that since this post. A die hard platinum in the front and dura last platinum in the back. Thanks for taking the time to reply

 

Yeah, looks like they removed their VQ35 offerings. Might not be a bad thing, it'll run you $700. They'll build one for you anyway if you contact them. They don't have one listed for my Benz but they made one for me.

How is the electrical holding up? Any issues with just the two batteries?

 

GOod so far. 1500 watts with the stock 130 amp alternator, big 3, and 2 AGM batteries seems to be enough. Installing a touchscreen next week. I'm actually having a new motor put in at Nissan. Blew a head somehow and decided to finance a new ( used) engine. Anxious to get it back. They're installing a Hayden tranny cooler too. After spending so much on the car I need the transmission to last.

 

Nice. Please start a new thread on the blown head. THAT is pretty unheard of! Would love to hear that story.

 

Yeah it's pretty messed up. Another mechanic, local guy, put the coolant he drained out of my car back into it after doing an alternator replacement. I told him not to but he did anyway then 8 miles later it ran hot. Didn't overheat. Just shut off and the gauge went up. A month later steam comes out my exhaust. Coolant leaking in the head gasket. Also air in my coolant. So bad I could hear swooshing in my dash from the heater core. All this started from needing a new alternator. The car only had 108,000 miles on it. Well taken care of. All in the past 2 months I've spent$9850 on it. All started just needing an alternator. Local mechanic did a number on it. Can't prove it though. I'll leave a new thread explaining it all at some point. Btw, new motor with 98,000 miles is $6000 installed.