Re: Moving battery: cable sizing, grounding ?'s
- From: Lawrence Glickman <Lawrence_Glickman@xxxxxxxxxxx>
- Date: Sat, 04 Feb 2006 14:42:20 -0600
On Sat, 04 Feb 2006 20:18:57 GMT, Jim <dREMootOVE2@xxxxxxxxxxxxx>
wrote:
I have a typical nose heavy compact wagon and want to move the battery
from the engine compartment, to the rear of the vehicle. I have two
tech details to work out.
1. What size of batt cable to use. I will be using tinned marine grade
wire, from Ancor Marine. The run will be no more than 15' long. Engine
size is 2.5 litre, alternator is 60 amp.
2. Whether to run the ground from the battery post all the way back to
the front of the car, or just ground to the body somewhere near the
battery, or ground to body near battery and also run a smaller gage
ground all the way forward.
In case anyone is concerned about fumes from the battery, I will be
using a battery that has provisions for adding a vent hose.
Jim
Just for convenience, I would use welding cable. The kind used for
Arc Welding.
As for grounding, it depends on how your vehicle chassis is assembled.
If you can get wires long enough to reach from the engine to the trunk
area, read the resistance of those leads. Subtract that test wire
reading in ohms from what you get when you measure from the engine
block to a non-painted area in the trunk compartment. If you have
less than 1 ohm, after subtracting the DVM test leads resistance,
you're good to go with grounding to the chassis in the trunk area. On
an unpainted area. IOW, scrape/file down to bare metal, tap, put lugs
on the B minus, and bolt on the cable.
STILL! ( this is important ) run the welding cable from the battery B
minus up to the ENGINE BLOCK and bolt it on there, where it is
probably already bolted on.
You want two grounds.
One back to the engine block
One to the chassis of the vehicle, if you can get under 1 ohm chassis
resistance from the front of the vehicle to the back. This is
possible if you have a Unibody welded chassis like I do. On an older
vehicle, you can put ground straps ( braided cable shielding ) between
the front end and the passenger compartment, and another strap or
straps between the passenger compartment and the rear of the vehicle.
My ideas.
Lg
.
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