"RST Engineering" wrote in message m...
Dan et al ...

The "tiny fuse" you refer to is actually a single fuse mounted as close as
possible to the battery box. AIVR, you can have either 3 or 5 amps directly
from the battery (i.e. a 3 or 5 amp fuse) in a "keep alive" circuit that
doesn't go through the master relay but is wired directly to the battery.
That circuit is then wired to the clock and any other avionics that need to
draw (usually microamps) current to keep memories alive and the like.

In the Cessna, I mounted that fuse on the master relay bracket and got the
"hot" from the master relay itself on the upstream side of the battery.
Minimum wire and minimum chance for fire if the wire insulation shorts to
ground. Use a rather thin wire with an extra coat of heavy shrink sleeving;
if it DOES short to ground it will fuse rather than start a fire.

Jim

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What size wire do you recommend? 22ga?