what’s the average amp’s of a good alternator ???

[robbie_turner 10+ year member]

my stock alternator is rated at 85amps. i have no idea if this a really poor one or not. I’m finally going to get around to do the Big 3 tomorrow. just wondering if that doesn't work judging on the 85 amps do you think i will be dipping in to my back pocket for more money on Car Audio??????

Oh and as my thread asked what size is a good alternator

Click to read more...

 

[saosin 10+ year member]

i would like to say 200 amps, that's what i see alot of people running but i could be wrong....

 

[robbie_turner 10+ year member]

and my 85amp is a normal stock alternator or not.

 

[iceteebone 5,000+ posts]

85 amps is pretty normal for a stock alternator. mine is 90 amps. a good size depends on what equipment you plan to run on it.

 

[jacko 10+ year member]

i find it really wierd that i have been reading that my '97 bonnevilles alt is 124-130 amps, that is more than a lot of trucks out there.

 

[squeak9798 5,000+ posts]

All my stockies have been GM 105A alts. 85A isn't the weakest on the market, but it definitely isn't a very strong alt.

 

[robbie_turner 10+ year member]

the thing is at the moment im getting pretty big power dips and im running a small set up;

one Sony 250 watt max for a 12" sub

One Sony 600watt max for 2 6*9's

i have had these for ages now and i haven't bothered to up grade because my electrics are band enough now

 

[robbie_turner 10+ year member]

with the big 3 should i be able to run these and nearly full wack with out any power dips or will i have to look into getting a new alt? also what would you do first buy a alt or a deep cycle battery???

 

[iceteebone 5,000+ posts]

with the big 3 should i be able to run these and nearly full wack with out any power dips or will i have to look into getting a new alt? also what would you do first buy a alt or a deep cycle battery???

i would go alt. then battery. i'm suprised you are having troubles with those 2 amps. my 2 PG amps slightly stress my stock 90 amp electrical system. i'll be throwing in a 200 amp alt. and big 3 upgrade soon. i went with the 200 amp in case i plan to uprgade amps later.

 

[robbie_turner 10+ year member]

thats what i can not get my head around. could it be as simple as the battery is not good or could the alt be faulty? the car is 4 years old. its a Rover 25 BTW do you guys have this in the states its also the same as a MG ZR???

 

[80INCHES 5,000+ posts]

my stock alt is 110amps.......i think that cool being that its stock......i plan on running an orion 2500 and orion 7005,,, i know i'll be pulling current out the aaassss...but i'll do the big 3 soon to see if it will help...already got the batts so i'm good

80

red top batt 4 starts and yellow top 4 music....with the stinger isolator in the middle of all the maddness

 

[robbie_turner 10+ year member]

my stock alt is 110amps.......i think that cool being that its stock......i plan on running an orion 2500 and orion 7005,,, i know i'll be pulling current out the aaassss...but i'll do the big 3 soon to see if it will help...already got the batts so i'm good

80

red top batt 4 starts and yellow top 4 music....with the stinger isolator in the middle of all the maddness

Good for you mate, oh and cheers for the help

 

[80INCHES 5,000+ posts]

ok no problem

80

 

[iceteebone 5,000+ posts]

thats what i can not get my head around. could it be as simple as the battery is not good or could the alt be faulty? the car is 4 years old. its a Rover 25 BTW do you guys have this in the states its also the same as a MG ZR???

what size power wire you have going to your amps?

 

[RCwhat 10+ year member]

upgrade your ground wire from the negative terminal to chassis to at least 4awg. This is the most important wire in the big3 as electrons flow from neg to pos. The engine is also bolted to the chassis using metal motor mounts (most cars) so the other ground isn't as neccessary. Upgrading the wire from the alt to the battery shouldn't do too much unless you've upgraded the alt as the stock wire is SUPPOSED to be able to flow as much current as the stock alt can put out. The amp will only be able to pull as much current as the ground wire can feed.....make sense????