Jeff,

Fuse for the wire size. You can use a lower amp fuse that will handle
the alternator rated current but the fuse is there to protect the wire.
I have a 60A alternator and use #6 wire with ANL 60A fuse.

Bobby



-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, August 02, 2018 10:39 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Alternator Damaged - Internal Short

Bobby, no I did not fuse the B lead.  What amperage would it be if
installed?
Jeff

Jeff,

Do you have a fuse in the B lead?

Bobby

-----Original Message-----
From: Jeff Whaley
Sent: August-02-18 10:41 AM
To: Rotary motors in aircraft
Subject: Alternator Damaged - Internal Short

Last Thursday I decided to try my cooling on a hot day 32C (90F);
orbiting the airport, the cooling wasn't too bad but while waiting for
the temps to stabilize I smelled smoke so landed immediately.  Saw a bit
of smoke exiting the oil cooler plenum so thought I was baking some
fiberglass.
On the weekend I did a more thorough inspection and found the battery
mains cable burned where attached to my alternator cut-out relay and the
relay fried to the point that the input terminal was loose.  The
connections stayed in place but open-circuited the relay - so the engine
never skipped a beat and I was unaware there was an electrical problem
at the time. Only reporting this now as it took me a while to get the
alternator tested.
Jeff

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