Steph, The master switch is that way by design. Usually, you do not want the alternator on line without the battery in the loop as most alternators will get a runaway overvoltage condition which will damage your avionics, or with no voltage to excite the alternator, they won't produce anything. When the master relay is open the battery is isolated to the lead between the battery and the master relay, and the lead from the master relay to the master switch. When you turn on the master switch, that provides the ground for the master relay connecting the battery to the rest of your electric system. There may be instances with some dynamo type alternators where it is possible that you might want to be able to apply power from the alternator without a battery in the loop, but that circumstance would be quite rare.
I find that my Regulator indicates a 5 amp draw when I have the alternator enabled before the engine is started. So, it is my practice to only turn on the battery half of the master switch, start the engine, then turn on the alternator half of the master switch once the engine is running. -Jeff Scott Los Alamos, NM ------------------------------- Cc: "Stef den Boer" <stefk...@ziggo.nl> Subject: KR> Master switch wire Hi, I received today the master switch(Cessna)from aircraft spruce. I understand how to wire it, but I think if you wire it the right way it is not possible to isolate the battery. There are 2 small noks in the red switch so you can switch of the altenator. But if you want to keep the alternator connected en switch off the bat, the aternator will switch off to. It is easy to remove the 2 small noks but wat is your experiance? Stef Steph and his dad are building the KR-2S see http://www.masttotaalconcept.nl/kr2 _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
