Thanks, Steve, that helps.

Jim

On Thu, May 2, 2013 at 3:23 PM, Steve Cotsford <cotsford@aol.com> wrote:

> One 55 watt bulb would take approx 4 1/2 amps at 12 volts.  A pair of H2
> bulbs would take about 9 amps.
>
> The bigger the cable, the lower the wire losses due to heat.    However
> even 16 ga would be ok for 2 regular wattage lamps.  14 ga would be better.
>    Yes the ground wires need to be the at least the same size as the
> largest positive wires you use.
>
> Steve
>
> On May 2, 2013, at 4:01 PM, Jim Felder wrote:
>
> > I have a number of good 40A relays that I'd like to use on a lighting
> > project. How many H2 bulbs would it be safe to power a pair of H2 bulbs?
> >
> > What wire size should provide power to the relays from the batteries
> using
> > a single relay? What about two?
> >
> > Would the wiring from the device to the relay be any different than the
> > size from the relay to the battery?
> >
> > Do the ground wires need to be the same sizes?
> >
> > Where does one get the kind of female spade connectors with the little
> tang
> > on the side that keeps them in the plastic relay mounts that VW uses?
> >
> > Thanks,
> >
> > Jim
>
>