[Milsurplus] Accessory Bus in vehicles

[Smith]

We use a latching relay circuit that is "armed" but not activated  by the keyed
accessory circuit. Then the  "radio bus system"still has to be  activated by the
driver after the start,   Saves a lot of radios from being zapped by that famous
kick on the vehicle DC bus after the starter load  lets go when the starter
switch is released. I highly recommend not having any of the newer Jap Rice
boxes on line during a start.

breck k4che


----- Original Message ----- 
From: "Tom Norris" <r390a@bellsouth.net>
To: <milsurplus@mailman.qth.net>
Sent: Saturday, November 29, 2003 6:10 PM
Subject: Re: [Milsurplus] Accessory Bus in vehicles


> I always *made* a standardized hookup when I was doing installs - which
> I did for over 20 years, both in private shops and for various govt agencies.
> Simply used the ACC bus to drive the relay coils that actually switched power
> to the power accessories used. Almost always tapped it at the fuse block,
since
> it was easier - for the standardization reasons already cited. Since I kept
> my own switched power bus the same from vehicle to vehicle, I only had to
> dig for the accy power once per vehicle.  And with each relay fused, I never
> had a problem with the equipment damaging something expensive like an
> ignition switch. :-)
>
> Tom
>
>
> >It makes it a lot of fun when you are trying to install alike
> >radios, equipment or
> >lightbars in dissimilar govt, mil or public safety vehicles.  No
> >standardization...
> >Jay
> >
> >----------
> >Just a little comment on the ACC mode in automobiles, it is
> >interesting to note how the different manufacturers model
> >their ACC circuits in today's
> >vehicles.
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