Benefits of upgrading to a high ampere alternator (65 - 95)?

**AcidBurn** · February 7th, 2014 11:14 AM

Mga sir, ok lang ba mag-upgrade ng high ampere alternator for honda stock engine like ph12? Will it only have good effects or may disadvantages din? TIA

**K.I.L.L.** · February 7th, 2014 11:16 AM

Originally Posted by AcidBurn

Mga sir, ok lang ba mag-upgrade ng high ampere alternator for honda stock engine like ph12? Will it only have good effects or may disadvantages din? TIA

You'd probably want to upgrade your wiring too.

**7138** · February 7th, 2014 11:27 AM

maybe a bit of engine power will be sacrificed kasi your engine
will be spinning an alternator with a bigger capacity.

pero baka neglible din naman.

**kinyo** · February 7th, 2014 12:59 PM

if you won't be needing the extra power the new alternator will provide ... it is just a waste of money

**glenn manikis** · February 7th, 2014 02:53 PM

IMO.. the bigger the better.. done that on my van... from 95amperes to 140amperes...

Fuel consumption, power... no change at all... the same lang...

ang napancin ko lang mas tumagal ang life ng Battery ko, mas lumamig A.C. maybe because mas lumakas ang mga buga ng hangin ng aircon aux fan...

electricals.. wala naman kailangan baguhin.. at pareho lang naman na 12volts yan...

lastly easier morning start ups.... lalo na luma na ang van ko..

**cocoy** · February 7th, 2014 11:22 PM

Originally Posted by glenn manikis

IMO.. the bigger the better.. done that on my van... from 95amperes to 140amperes...

Fuel consumption, power... no change at all... the same lang...

ang napancin ko lang mas tumagal ang life ng Battery ko, mas lumamig A.C. maybe because mas lumakas ang mga buga ng hangin ng aircon aux fan...

electricals.. wala naman kailangan baguhin.. at pareho lang naman na 12volts yan...

lastly easier morning start ups.... lalo na luma na ang van ko..

curious lang sir.. what van do you have and where did you find that 140ampere alternator.. thank you..

**StBernard15** · February 24th, 2014 12:25 PM

I read somewhere na kapag mataas an amperes, dapat baguhin din ang wiring kasi ang dadaan na kuryente mas mataas na. is this true? kasi i recently bought a surplus na 30 amp fuse para sa power window ko. pero recommended ng Isuzu 20 amp lang. pero wala ako mahanap, kahit sa Banawe. safe kaya 'yun? input naman mga sir. thanks

**falken** · February 24th, 2014 12:39 PM

Originally Posted by StBernard15

I read somewhere na kapag mataas an amperes, dapat baguhin din ang wiring kasi ang dadaan na kuryente mas mataas na. is this true? kasi i recently bought a surplus na 30 amp fuse para sa power window ko. pero recommended ng Isuzu 20 amp lang. pero wala ako mahanap, kahit sa Banawe. safe kaya 'yun? input naman mga sir. thanks

I changed my 70 amp alternator to 110 about 7 years ago. Didn't change the wiring & it's still working fine.

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**s10pao** · February 24th, 2014 12:42 PM

Originally Posted by StBernard15

I read somewhere na kapag mataas an amperes, dapat baguhin din ang wiring kasi ang dadaan na kuryente mas mataas na. is this true? kasi i recently bought a surplus na 30 amp fuse para sa power window ko. pero recommended ng Isuzu 20 amp lang. pero wala ako mahanap, kahit sa Banawe. safe kaya 'yun? input naman mga sir. thanks

assuming hindi ka magdadagdag ng devices, in theory dapat hindi. for example, kung yung total current consumed ng lahat ng devices mo ay 50A, kahit 100A ung rating ng alternator mo, 50A lang ang i-de-deliver nya.

Kirchhoff's circuit laws - Wikipedia, the free encyclopedia

**jhnkvn** · February 24th, 2014 01:00 PM

kinyo here is correct.

Thread: It is useless unless you plan on using the extra power. Your stock alternator was designed with your stock electrical system in mind. If it's rated 70A, then it's highly unlikely you'll be using more than 70A without changing anything.

Newer vehicles nowadays have higher-rated alternator amperes thanks to more complex electrical systems. Electrical power steering, heated seats, etc. means that 110A or more is pretty much standard for anything costing more than a million pesos.

Wires: The purpose of a wire is to carry current from point A to point B. Getting a thicker wire will simply reduce the flowing electrical resistance. Different wire sizes are rated to handle different ampere ratings. There's not much of a point in trying to get 0GA wires for your windshield wiper relay for example.

My take is not to touch the existing electrical wiring in the car unless you think something's wrong (ex. oxidized wiring is causing you problems)

Tidbit: Alternator ampere rating is simply the maximum capacity. How much power it'll be giving at a certain RPM differs. Some alternators supply a huge amount of power initially and scale it a bit at higher RPMs while some alternators supply a small/medium amperes and scale it better at higher RPMs. Parang horsepower and torque graphs lang sila ;)