From: Mil-Veh Co. (milveh@sbcglobal.net)
Date: Mon Apr 04 2005 - 08:33:35 PDT
Thanks Chance, I'll give that a try! Jack
--- chance wolf <chance_wolf@shaw.ca> wrote:
>
> ----- Original Message -----
> From: "Mil-Veh Co." <milveh@sbcglobal.net>
> To: "Military Vehicles Mailing List"
> <mil-veh@mil-veh.org>
> Sent: Sunday, April 03, 2005 7:47 PM
> Subject: Re: [MV] One more M151 Question
>
>
> > What's the job of the capacitor in the M151, is
> that
> > to filter A/C and only allow D/C current to flow?
> >
> > T-I-A
> >
> > Jack
>
> It's part of the radio-filter system designed to
> keep "engine noise" to a
> bare minimum when you're using radio equipment. If
> you've ever listened to
> AM radio on an unshielded vehicle, you get all sorts
> of spark-plug pops and
> alternator whine and a ton of other crap
> superimposed on the audio, so they
> incorporated filters and grounding straps and
> shielded plug wires to help
> reduce it all to a dull roar.
>
> A capacitor passes alternating current but not
> direct current, and is rigged
> in the 151 to pass that alternating current (all the
> line noise generated by
> the points etc.) straight to ground, without
> interfering with the 24VDC
> supply to your points and coil. When the capacitors
> dry out and go bad they
> can sometimes act like big resistors and start
> shorting out a fair portion
> of your 24VDC to ground right along with the AC
> component, effectively
> delivering a substandard voltage to your points/coil
> (same with a
> failing/failed condenser on the point-plate.)
>
> What you can do is bypass the filter entirely and
> run a 24VDC wire straight
> to your battery to the coil (i.e., remove the filter
> assy and run the wire
> straight up through the resulting hole) and take it
> for a test-drive. If
> your problems are solved - voila - you've nailed it.
> Most problems I've had
> with the thing are right where the wire solders on
> to the far end of the
> filter assy. I've had some which were poorly
> soldered or green'n'fuzzy with
> corrosion or holding on by two strands of steel wire
> - all of which caused
> major ignition problems.
>
> Have fun.
>
>
>
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