Jumper cable amp rating

**av8or5** · July 12th, 2013 02:59 AM

If you will buy jumper cable, please buy the biggest amp possible. I just experienced this lately. I bought a jumper cable a year back and when I checked the information on the bag, it can start engine up to 2.0 liters. Good thing my car who had a dead battery was a 2.0 liter car. The indoor dome light was left on for two weeks leaving a really dead battery.

Unfortunately, the cable wasn't long I couldn't connect the negative of the dead battery to the engine block...so no choice.. neg to neg battery terminal. It worked fine..but as they always say...best to connect neg clamp to the engine block of dead battery.

Anyhow, another tip which also helped me, as I tried to start the dead car, it just kept on clicking..in short, not enough power was coming in to start the car..then I remember someone telling me to rev the good car to give more power...and yes..thats what I did.. rev the car with good battery.after a few seconds, I started the car with dead battery..finally..it starts....

Now, I am not an engineer..nor a electrician... bakit kaya more power was given to the dead car when you rev the engine of the good battery/car?

**dr. d** · July 12th, 2013 03:03 AM

Now, I am not an engineer..nor a electrician... bakit kaya more power was given to the dead car when you rev the engine of the good battery/car?[/QUOTE]

because when you rev the donor car, the electricity going to the recipient car is actually coming from the alternator, not the battery.

**brainmafia_310** · July 12th, 2013 04:13 AM

Originally Posted by dr. d

Now, I am not an engineer..nor a electrician... bakit kaya more power was given to the dead car when you rev the engine of the good battery/car?

because when you rev the donor car, the electricity going to the recipient car is actually coming from the alternator, not the battery.[/QUOTE]

Because it is still drained and can absorbed much of the power. If you just parallel the battery one with 100% and one with 0%, under perfect condition at some point they will become equal 50/50 split.

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**Retz** · July 12th, 2013 08:37 AM

Mas problemahin ko pa ang jumper ng kapitbahay kesa itong jumper cable.

**confused shoes** · July 12th, 2013 08:55 AM

Originally Posted by av8or5

Now, I am not an engineer..nor a electrician... bakit kaya more power was given to the dead car when you rev the engine of the good battery/car?

Walang pinag-iba nyan sa engine. If you rev it, you will get more power.

The alternation is a generator. An AC source converted to a DC with rectifiers. To simplify things, we assume the alternator will rotate at one cycle per second and assume one AC cycle in one rotation. If you will rectify that, it will produce one DC component in one second. So if you will rev the engine say twice then you can produce 2x DC components in one second. If you rev 10x, that is 10x DC components. The more DC components produced in a given time, you will have higher DC average.

**Retz** · July 12th, 2013 09:17 AM

^

When speed or rpm is increase, frequency (ac) is also increase, power also increases directly proportional mga yan.

**joemarski** · July 12th, 2013 09:21 AM

Originally Posted by Retz

Mas problemahin ko pa ang jumper ng kapitbahay kesa itong jumper cable.

'yan kasi ang kadalasang pinagmumulan ng sunog > ILLEGAL ELECTRICAL CONNECTIONS. :mad:

BTT
So, how are we going to determine the right size or Ampacity (Current Carrying Capacity)
of the Jumper Cables?

**kapitan88** · July 12th, 2013 09:25 AM

for newer cars na naka ic chip na ang regulator ng alternator, wouldnt this burn your regulator pag nag host ka ng jumper?

**jick.cejoco** · July 12th, 2013 09:33 AM

Originally Posted by joemarski

'yan kasi ang kadalasang pinagmumulan ng sunog > ILLEGAL ELECTRICAL CONNECTIONS. :mad:

BTT
So, how are we going to determine the right size or Ampacity (Current Carrying Capacity)
of the Jumper Cables?

So, how are we going to determine the right size or Ampacity (Current Carrying Capacity)
of the Jumper Cables?

Shop Tools, Farm Machinery | Agriculture.com

**joemarski** · July 12th, 2013 10:11 AM

Originally Posted by jick.cejoco

So, how are we going to determine the right size or Ampacity (Current Carrying Capacity)
of the Jumper Cables?

Shop Tools, Farm Machinery | Agriculture.com

Thank you very so many sir jc :thankyou:

Tamang- tama na siguro 'yung kabibili ko lang na Jumper Cables.
"500AMP" daw ang nakalagay doon sa karton niya sabi nung tsimay namin sa bahay.
Less than a month pa lang 'yun. at 500kesos lang (China for sure) bili ko sa Evangelista.
Puwede na siguro 'yon... 'wag lang gawing Jumper sa Trucks.