How can I make new P-Leads?

[Justin H]

I have some Bendix S4LN Mags and the P-Lead shielding is in bad condition
and I'm having noise problems. Can they be bought prebuilt or do I have to
buy wire and connectors and crimpers. Ive searched aircraft spruce and such,
I guess they dont sell it or im searching the wrong thing.

[jls]

"Justin H" > wrote in message
...
> I have some Bendix S4LN Mags and the P-Lead shielding is in bad condition
> and I'm having noise problems. Can they be bought prebuilt or do I have to
> buy wire and connectors and crimpers. Ive searched aircraft spruce and
such,
> I guess they dont sell it or im searching the wrong thing.
>
>

The ends can be purchased from API and McFarlane. You solder a bead on the
mag ends, then sand the bead flat. Not hard to do but you need good
shielded wire which is available through Spruce or other sources. The
cable I used also had a teflon cover over the shielding. I could not find
cable as thick as the original on a 172. The A&P said that was a typical
problem but that the cable available was of a sufficient gauge.

So far, so good. I test the p-leads occasionally by turning the switch to
'off' when the engine is idling.

[Orval Fairbairn]

In article >,
" jls" > wrote:

> "Justin H" > wrote in message
> ...
> > I have some Bendix S4LN Mags and the P-Lead shielding is in bad condition
> > and I'm having noise problems. Can they be bought prebuilt or do I have to
> > buy wire and connectors and crimpers. Ive searched aircraft spruce and
> such,
> > I guess they dont sell it or im searching the wrong thing.
> >
> >
>
> The ends can be purchased from API and McFarlane. You solder a bead on the
> mag ends, then sand the bead flat. Not hard to do but you need good
> shielded wire which is available through Spruce or other sources. The
> cable I used also had a teflon cover over the shielding. I could not find
> cable as thick as the original on a 172. The A&P said that was a typical
> problem but that the cable available was of a sufficient gauge.
>
> So far, so good. I test the p-leads occasionally by turning the switch to
> 'off' when the engine is idling.
>
>

Even Radio Shack has shielded wire that will work. There is little
amperage through the P-leads. All they do is ground the mag coil.

[Roger Halstead]

On Tue, 5 Oct 2004 21:07:28 -0400, " jls" >
wrote:

>
>"Justin H" > wrote in message
...
>> I have some Bendix S4LN Mags and the P-Lead shielding is in bad condition
>> and I'm having noise problems. Can they be bought prebuilt or do I have to
>> buy wire and connectors and crimpers. Ive searched aircraft spruce and
>such,
>> I guess they dont sell it or im searching the wrong thing.
>>
>>
>
>The ends can be purchased from API and McFarlane. You solder a bead on the
>mag ends, then sand the bead flat. Not hard to do but you need good
>shielded wire which is available through Spruce or other sources. The
>cable I used also had a teflon cover over the shielding. I could not find
>cable as thick as the original on a 172. The A&P said that was a typical
>problem but that the cable available was of a sufficient gauge.
>
>So far, so good. I test the p-leads occasionally by turning the switch to
>'off' when the engine is idling.

If you're real quick you can turn them back on and clean any
restrictions out of the mufflers at the same time. you know, things
like flame cones?

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
>