I saw another thread on batteries and didn't want to hijack. This may be kind of a gay thread, but thought I may benefit from a little bit of knowledge from you experienced professionals.
I was just wondering if a higher ampreage battery could be causing damage to the electrical system? I see all kinds of posts about putting a larger than needed battery in your vehicle. I can understand a higher output alternator when you have extra loads, because the ac output on the alternator gives just enough for the battery to charge anyways. (AC Current doesn't go through your electrical system, unless your battery if fried. In which case your asking for electrical damage.) My question, Is there some kind of device that restricts to much current to going to your PCM inputs? I know in most american cars, and probably nissan's as well, that on most TPS's, MAP's, etc there is a 5v reference wire, that also limits current....However items like your fuel pump and MAF, PCM, TCM, and HO2S (Heated 02 sensor) get battery voltage, and I assume battery current. Please correct me if I'm wrong, and explain why, but wouldn't putting a 1200 CA battery into a recommended 650 CA vehicle cause prematury failure of parts????????

 

No, it shouldn't cause any damage. Higher amperage battery only means that your battery is capable of supplying higher currant. Car batteries are more like a non-ideal voltage source. (Constant voltage, currant depends on the load)

 

It all makes since now. That's why the change in current on a fuel pump when giving it fuel. (amp meter.) It only takes what it needs. Thanks u r the shiznit

 

yes, and load = resistance. on pcm inputs, some range from .5 V to 2 V signals, and are controlled. the CA/CCA is cold cranking amps, meaning more current to start. all vehicle batteries are rated at 12.6 Volts; 2.1 V for each of the 6 battery cells.