Electricity Experts (serious problem)

[mr_f4ke 10+ year member]

I have a 70 amp alternator with a kenwood 300 rms. When i start the A/C , lights and my stereo always show me the car the red battery alarm, i have a new battery, and new alt, what can be the problem? now im going to install the RF P6001BD, i have to install a capacitor? what about the big 3? another think, my car alarm is broken, but sometimes works, i don´t know there, that can be a problem for my battery? thx.

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[DBfan187 5,000+ posts]

Forget the cap. Do the big 3.

 

[mr_f4ke 10+ year member]

How much cost the big 3?

 

[DBfan187 5,000+ posts]

How much cost the big 3?

www.weldingsupply.com for you to use my young gwasshoppa!

- Yoda drunk

15' of 1/0awg should be enough for you. Lugs and tape maybe more.

 

[jellyfish420 10+ year member]

almost 1000w off a 70A alt. . . i don't know,try the big 3, you might need a bigger alt.

 

[mr_f4ke 10+ year member]

i will try the big 3

 

[helotaxi 5,000+ posts]

If you are getting the battery light then your alt is not supplying the current needed to run everything and still charge the battery. The battery is discharging with the car running and that is what gives you the light. You need a bigger alt.

 

[mr_f4ke 10+ year member]

But im just running 300rms with a 70 amp alt, maybe the problem is the wiring..

 

[Shyne151 10+ year member]

j/w... what kind of car is it?

 

[req 5,000+ posts]

yea. do the big3.

see if it still has this problem, then splash the cash for a new alt. i would go back to the shop, see if you can exchange your alt for a new higher rated one.

if not, try and get a high output one on ebay.

on a side note- does anyone know how to install a new alternator belt? how do you loosen\tighten that belt?

 

[1972ChevyGuy 10+ year member]

You need a wrench that will fit the idler pulley. Turn it one way and it loosens tension on the belt. The nut itsself doesnt turn, it just moves the pulley. The idler pulley should be preset so you wont have to tighten it.

 

[swimfreak26 10+ year member]

I wouldn't jump into upgrading things right away, check wiring of your alarm and setup. I have been running a Hifonics bx1000d off my 70amp stock alt for months without a hitch, and my battery isn't even that new (a few years old).

Make sure what you have is set up right, then upgrade if you need to.

 

[clarity413 10+ year member]

You need a wrench that will fit the idler pulley. Turn it one way and it loosens tension on the belt. The nut itsself doesnt turn, it just moves the pulley. The idler pulley should be preset so you wont have to tighten it.

Why didn't you tell me that. It took me 2 and a half hours to figure out howto get my alternator back on the belt. Then again, my father told me that they used a special machine to stretch out the belt so I was trying to find a way around that. SOB, stupid dad

 

[clarity413 10+ year member]

Use a DMM to see how much voltage you get to your amp with the car on... then see how much you get from your car without the amp in... If your amp is getting over 13.6 volts you don't really need a new alternator right now... with the other one you will though. It's probably another problem though.

 

[travisx01 10+ year member]

70 amp alternator is probably stock for your stock components.

300W/14.4~12V = 20.8 to 25 additional amps being loaded onto your alternator.

Thats just at 300 watts rms, consider your peak wattage also, depending on how often your amp is creating more than 300 watts.