On Thu, 16 Aug 2012 07:03:50 -0700, Larry Jaques
wrote:

On Thu, 16 Aug 2012 17:25:37 +1000, John G
wrote:

John B. formulated on Thursday :
On Wed, 15 Aug 2012 19:38:19 -0400, wrote:

On Tue, 14 Aug 2012 20:27:20 -0700, "Steve B"
wrote:


"Richard" wrote



If it's more than a single axle, remember, they are to be wired in
parallel, not series.

A battery and controller sitting by the wheel might help.

Wire it up and squeeze the tit.
See it the brake moves.

Check them all, If they all work, back track through the wiring to the
connector.

DON'T use the trailer frame for ground!

And a circuit tester with a light works better than volt meter.

Thanks for the tips. I woulda got the ground thing wrong.

Steve

Commercial trailers have been using the frame for ground for decades -
and it works if it is done PROPERLY. Harder to screw up a fround WIRE
than a frame, but also easier to damage the WIRE. Six of one, half
dozen of the other, in my books. I'll stick with a "chassis ground" -
same as used on the tow vehicle, and same as has been used for
decades.

Don't most automobiles uses a "frame ground" :-)
Cheers,
John B.

No.

Correct. And I recreated all sorts of wiring looms for autos for which
no harness was available back when I worked at the body shop.

Only the Brits, using "Lucas, Prince of Darkness" technology, use body
and frame grounds. Ask any Brit car owner how he likes it.
But be prepared to run. Some are _really_ fired up about it.
I beg to differ with you. Body grounds were very common on every
American,Japanese, or German car I ever worked on as a professional
mechanic , and my current vehicles (OK, they are 10 years old) still
use chassis/body grounds for the majority of the circuits. Tearing the
wiring harness out of a friend's Miata, there were numerous "ground
points" where the black ground wires were screwed to the body/chassis
and a friend's F150 also used body grounds extensively - and one that
was connected to a patch of ferric oxide caused considerable problems
untill it was located (and the windsheild fixed to prevent more
rusting)