High Voltage Surge

[Rawze]

(12-16-2016 )CFR__AND_SONS Wrote:  Turns out my truck take the 165 Amp alternator but its not in stock. Called fleetpride and they have a 170 Amp Delco in stock for less than 500. Would the 5 extra amp make my voltage go up even more? or is the new alternator suppose to fix the high voltage?

I wanted to go with a Leece-Neville based on your guys' comments but I cant find a part number. I checked their website but couldn't find it on there using their application guide...

The size of the Alternator should not make the voltage higher.


For the new one, the voltage on most will be 13.8 - 14.1 ish. Some are 13.6 - 14.4, and for gel-cell batteries, it needs to be 13.2 only. -- If it is outside of this range, then you may have other problems too.

Some Alternators/trucks have a feedback wire to help regulate the voltage at the batteries, some do not. Unless you have gel-cells or some kind of special type of battery that specifically needs it, I would suggest disconnecting any remote sensing and just jumper it at the Alternator so that it only outputs a steady voltage. Less problems long term that way. The instructions that come with the Alternator usually show how to jumper it when remote sensing is not used.

Lastly, if you have a prostar, your truck takes a pretty standard "pad-mount" style. There are lots of brands and sizes avail. Don't get taken just because some person at a distributor is too lazy or dumb to look it up correctly.

Here is one that would have worked just fine on my prostar if I didn't have that 4,000 watt inverter...

https://www.peterbiltparts.com/electrica...700018rman


-- Make sure you buy a new pulley for it too. Always a good idea, as most people damage/scar the old pulley trying to get it off. That and the fact that the old one gets polished from road dust and use, and it is more likely to slip under heavier amp loads.