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Bill, not up on the Z-19 guidelines (its been over 8 years {:>)), but here is what I would do with double battery set up. I would have it set up so that each injector pair and one coil run off of one battery connection, and the other set run off of the secondary battery connection. Ditto for the fuel pumps. In my case, I have it set up so either or both batteries can connect to my crucial systems bus through a 40 amp circuit breaker. Then all my crucial systems are connected to that bus. If a battery should go bad, I can disconnect it from the crucial bus by pulling the CB. That way you can run on one battery or two batteries. I initially used two batteries - for about 5 years, then decided that the second battery was not needed as I only used it to help start on cold mornings. So I dropped from 44 lbs of batter to 14 lbs - less to haul around. I do have a voltmeter which I constantly scan as well as an "Abnormal" voltage indicator right in front of my face on the instrument panel. I replace the Odyssey battery every two years and keep it on trickle charge with occasional "De-sulfication" through voltage pulses to keep the "plates" clean of sulfate. Don't know if this is of any help but that's what I did. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html That way should either battery ----- Original Message ----- From: "Bill Bradburry" <bbradburry@allvantage.com> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Friday, November 24, 2006 8:45 AM Subject: [FlyRotary] Z-19 questions OK, This is my fall back position. I have posed this question on the Aerolectric list for a couple of days and no answer. (although the email did get caught up in an embarrasing event!) 90% of you guys have already wired your planes and followed Bob N's advice, so how did you do the redundancy on the fuel pumps, coils, and injectors? from the AE list: "I am installing a fuel injected Mazda rotary engine and trying to follow the Z-19 guidelines for dual battery, single alternator. Looking at the engine primary and secondary circuit, I need to install a primary and secondary fuel pump, plus I want to power the coils and the injectors off of the battery buss. How should I do this? I suppose I could take the fuel pump diode output and switch it to either of the two fuel pumps??? What about the coils and injectors? Should I set up similar circuits for them, or is there a better way to reduce parts??? I would appreciate any guidance you guys could give me. Thanks and Happy Thanksgiving! Bill B -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/