Phaz

im currently doing a battery relocation

i need 2x 150amp circuit breaker Car & boot sound system

only problem is 2x Stinger 150 Circuit Breakers is £80.00 = $115.00

or i can get 2x Stinger 140 Circuit Breakers is £30.00 = $42.8082

question is, will a 140amp circuit breaker beable to put enough power to the starter? as it would save be lots of money in the endless money pit

Cheers
Lee

Obie2kenobe

I think that should be more than enough...I am not a professional but I am going to go out on a limb and say that these starters prolly don't pull much more than 100 amps if they even pull that.

Phaz

that what i thought, its just all the battery relocations ive seen have 150amp breakers, so its been playin on my mind, wonder what would be the worst thing that would happen if it wasnt enough

Obie2kenobe

the car would turn over slow???

Phaz

O i thought the circuit breaker would just keep going and id have to keep reseting it

rockshox

iTrader: (3)

the main fuse is 120a i believe but with a breaker its good to have some overhead beyond that because breakers are much faster and could be tripped by a sudden surge. Im using a 200a in mine.

moconnor

iTrader: (14)

I'm using a 150 amp breaker in mine and have never tripped it so I doubt 140 amps would make much of a difference.

Aeka GSR

iTrader: (4)

You can get those breakers for cheap from delcity.net or waytekwire.com

Phaz

cheers lads, ill order them today

habu2

150A vs 140A is a 7% difference. I would be surprised if their QC accuracy rating for either breaker is less than 7%

Phaz

cheers feel better now

jkstill

iTrader: (11)

Yeah, I bought a Stinger too.

Do you think Stinger is really making those circuit breakers themselves?

I don't - check this out: BUSS 150 Breaker

$22.80 US sounds a little better, doesn't it?

I'm pretty user a lot of companies OEM this circuit breaker and put their own brand on it.

Phaz

yer i think your right looks just the same and prob is, its a shame that stinger think if they put a stupidly high price on it people will always pay it. When your really just paying to have a gold Stinger label lol

TimeMachine

iTrader: (10)

If you're simply relocating the battery and running a line to the engine bay, do you really need a breaker near the battery? Thx...

moconnor

iTrader: (14)

Yes.

Try connecting a cable directly from the positive terminal to the chassis and see what happens.

Actually, don't - you may burn your car to the ground.

TimeMachine

iTrader: (10)

No no, not to the chassis... Running 4ga from the battery (bin) to under hood fuse block... critical to have a 150 amp circuit breaker in between?

Also, that happened when I was wiring a 1952 MG TD... Positive ground, go figure

moconnor

iTrader: (14)

The breaker needs to be as close as possible to the battery so that if the remaining length of cable becomes compromised in an accident or through abrasion it will trigger. Obviously, it will not protect the cable between the battery and the breaker but that length should be so short that it is very unlikely to happen.

That said, most cars don't actually have a breaker between the battery and the starter motor, even if they have the battery in the trunk. OEM cable routing is likely to be more secure than a user installation, however. Recent BMWs actually have a small explosive breaker on the battery terminal that is activated in an accident to stop the battery dumping current through a compromised cable.

For $20-$30 it is cheap insurance. Some breakers also have a cut-off switch, which is very useful.

TimeMachine

iTrader: (10)

I absolutely agree... just didn't understand how that all works. Thanks for explaining its necessity

Monkman33

iTrader: (28)

A fuse/breaker is in there to protect the wire from burning (and in turn the car). It is not there to protect the components hooked up to it. Because of this, it is required that you put the circuit breaker as close to the source of power as possible. If you have a short between the source and the breaker, the wire will burn and melt... completely. And could easily start a car-fire.

superjet3

iTrader: (38)

Also, the breaker should be matched to the gauge wire being used.

moconnor

iTrader: (14)

Only in the sense that the wire must have a current carrying capacity of greater than the breaker. You can use any gauge you want with a particular breaker as long as its current carrying capacity is larger than the breaker rating.

puma

iTrader: (2)

i have used many 80 amp breaker in my battery relocations so yeah, 140 will do...

oh and i never had one poped.

Monkman33

iTrader: (28)

moconner is right.

Your wire MUST be able to carry more current than the breaker is rated for. Otherwise, the wire will just burn before it ever pops the breaker.

I am willing to bet you don't even need more than a 100 amp breaker. Once the car is running, the battery doesn't supply power, it is being charged.

proz07

iTrader: (6)

if anybody cares you can pick these up in the states at your local autozone for $27. just picked one up for mine.
z