Battery Cable question and another electrical question
Posted: Sat Feb 18, 2012 10:12 am
I also wondered about the epoxy chromate reducing or eliminating conductivity between panels. So I measured the resistance between my outer wing skin and inner wing skin prior to, and after adding a ground strap between the panels. The resistance was very low, and unchanged when adding the ground strap. Thanks for the responses about the battery ground. I plan to jump to the floor stringer as was suggested. I also have a ground bus on the firewall where I will connect all the grounds for the stuff in the panel. That ground bus is connected to the engine and I added a ground strap from the ground block to the airframe since the stainless steel firewall is not the best conductor.
My other electrical question comes from looking at Tony Bingelis' drawing again. He shows shielded wire being used from the alternator to the main power bus, and also from the ignition switch to the magnetos. However, he also shows the shield for those wires grounded on both ends. I thought that was a no-no. I thought your were only supposed to ground on one end. I plan to use shielded wires on my alternator cable and the wires going to my ignition coils (MSD electronic ignition). I'm using a single wire alternator so I don't have a field wire to worry about. Does anyone know if the magnetic pickup wires to the distributer need to be shielded? Does anyone know where one can by tubular wire shielding in small quantities? Allied Electric only sells it in 100 foot rolls. I'd rather not have to spend $180 for six feet of shielding. For that matter, does anyone know where one can buy shielded 8 AWG wire a bit cheaper than the almost $5 a foot price at Aircraft Spruce?
Mike
----- Original Message -----
From: rognal@dcsol.com
Date: Friday, February 18, 2005 10:53 am
Subject: RE: Battery Cable question
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My other electrical question comes from looking at Tony Bingelis' drawing again. He shows shielded wire being used from the alternator to the main power bus, and also from the ignition switch to the magnetos. However, he also shows the shield for those wires grounded on both ends. I thought that was a no-no. I thought your were only supposed to ground on one end. I plan to use shielded wires on my alternator cable and the wires going to my ignition coils (MSD electronic ignition). I'm using a single wire alternator so I don't have a field wire to worry about. Does anyone know if the magnetic pickup wires to the distributer need to be shielded? Does anyone know where one can by tubular wire shielding in small quantities? Allied Electric only sells it in 100 foot rolls. I'd rather not have to spend $180 for six feet of shielding. For that matter, does anyone know where one can buy shielded 8 AWG wire a bit cheaper than the almost $5 a foot price at Aircraft Spruce?
Mike
----- Original Message -----
From: rognal@dcsol.com
Date: Friday, February 18, 2005 10:53 am
Subject: RE: Battery Cable question
John,
matingIf Epoxy Zinc Chromate is used religiously between all metalcontinuity ofsurfaces and all rivets are dipped wouldn't this break theI have even less knowledge of electrics than you, but had the sameground?
question.
I had chromated all the mating surfaces and dipped each rivet
also, and I
wanted to run local grounds for the Aeroflash strobe power
supplies mounted
on the wing tip ribs.
Using a multi-meter, I made several checks for continuity between
the main
spar and the tip rib and I always got a tone, indicating (to me) a
complete
circuit. The wiring is not completed so I can't tell you if it
will (or
won't) work yet.
Roger Hoffman #687R
Eugene, OR USA!
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