Jump Starting

[Taso84]

Got a flat battery 2nite, got my freind ova and we tried to jump start it by connecting termianls at the front, but it wouldnt start.

Then we conncted the terminals to the boot, where the batterey is and it started straight away,

wierd huh, can ne1 explain this?

[mad082]

whenever you jump start a car you have to connect to the battery. when you connect up the front you are running power though smaller cables back to the battery. juper cables carry more current than most of the wires in the car. when the battery is flat then the battery has to be brought up to charge first.

[sinistaGTR]

um i have jumped mine heaps from the front....... it is a jumpstart point for that reason.....sometimes the earth cable doesnt connect properly.....

[Craved]

same, they are made by nissan for jump starting.. since the battery is in the boot and behind the panels etc..

next time try a different earthing point on the engine itself.

[mad082]

just went and had a look, hadn't taken the fuse box cover off before so i never noticed it, my bad. so i'd say you had a bad earth, or the battery was really dead and it took a while to charge up.

when my battery went dead it took a while of jumping to have enough juice to turn over. part of the problem was crap thin leads.

[Cubes]

I've found the leads and connection point are a big part as to how well it jump starts.

Then next is the car jump starting.. For example mine idling will jump start anything instantly providing I use good leads and have a good connection.

The inlaws VN dunga door on the other hand has to have its rpm brought up in order to jump start mine and the inlaws bmw. Their BMW jump starts mine and the vn first pop.

I had to run a new earth wire from the battery to the chassis and block as I my battery was going flat really easily. 30-1hr of just the radio on would send it flat enough so that it wasn't able to start the car, even though the battery was showing 12+v.

Since the nice new fat earth wire went its been fine.