---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 06/25/07: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:35 AM - Battery switch () 2. 03:17 PM - Re: GRT-EIS Tach input (Peter Pengilly) 3. 05:02 PM - Latest GTX-327 manual? (Alan K. Adamson) 4. 06:24 PM - Best Practices - Resistors and pre-made harnesses (Dan Reeves) 5. 08:02 PM - Battery switch (Fergus Kyle) 6. 08:43 PM - Battery Switches (NEMuzzy) ________________________________ Message 1 _____________________________________ Time: 05:35:19 AM PST US From: Subject: AeroElectric-List: Battery switch 6/25/2007 Hello Ferg, Here is a company that sells a variety of mechanical battery switches. You might also want to consider this solenoid type switch with a very low amperage holding power. http://bluesea.com/category/1/products/5301 'OC' Says: "The best investment we can make is the effort to gather and understand knowledge." Time: 06:07:01 PM PST US From: "Fergus Kyle" Subject: AeroElectric-List: Battery switch Cheers, I have read that some are substituting race-car kill switches for battery contactors. At present I plan to start with only about 20 amps dynamo and regret the constant load of a contactor. If you are operating such a devise, I would admire a short description and appreciation of its use - and perhaps a point toward a useful source. US or UK no problem. Thanks, Ferg Europa Classic 914 mono ________________________________ Message 2 _____________________________________ Time: 03:17:38 PM PST US From: "Peter Pengilly" Subject: RE: AeroElectric-List: GRT-EIS Tach input The tach input to the EIS is fine if it comes from the back of the mag switches. Don't forget to put the 27Kohm resistors in series from mag switch to input change over switch. Doesn't need to be shielded, but probably won't hurt. See Bob's notes on grounding P leads (IIRC should not be connected to earth at the mag switch end), any continuation wire should be grounded at one end only - probably EIS end - and will not form any part of the mag grounding circuit. The purpose of the 27Kohm resistor is to make sure that's so. Pete -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of carlrai@aol.com Sent: 23 June 2007 11:56 Subject: AeroElectric-List: GRT-EIS Tach input Fellow Builders, Currently close to completing wiring on an RV-9A. Among the last of the connections to complete are the tach input to the GR EIS. I'm going to connect both mags to the input, using a switch to select L or R input for RPM drop at runup. Two toggle switches are used for the L and R mag on/off. Do I need to connect the tach input directly to the mags using a seperate shielded wire or can I simply use a double faston tab at the toggle switch to continue the mag wire to the EIS input? I assume if a continuation is acceptable, it should also be shielded with the shield grounded at the mag switch end - for noise only, not as part of the grounding circuit to shut down the mags. Any and all suggestions are appreciated. Carl Raichle Lutz, FL _____ AOL at AOL.com. ________________________________ Message 3 _____________________________________ Time: 05:02:08 PM PST US From: "Alan K. Adamson" Subject: AeroElectric-List: Latest GTX-327 manual? Anyone have a Rev K. of the 327 Transponder manual? The one that is publicly available is only J, and yet I have one page from a K and would like to see the remainder as the page I have a pretty different from the J version of the same page (it's the wiring schematic :) ). Thanks in advance, Alan ________________________________ Message 4 _____________________________________ Time: 06:24:10 PM PST US From: Dan Reeves Subject: AeroElectric-List: Best Practices - Resistors and pre-made harnesses I have a couple of basic questions about best practices... 1.) I have a Dynon EFIS that requires a few resistors on some of the sensor leads. What is the best way to connect the resistors? Is it OK to crimp fast-on, butt splices, ring terminals, etc directly onto the resistor itself and cover / protect everything with heat shrink? 2.) I have an Approach Systems harness for the Dynon EFIS and the SteinAir harness for the Dynon EMS. To connect the two units there are a couple of pigtails that I could just butt splice together. Is this OK to do or should I remove the wires / pins from one of the harnesses / D-Sub connectors and crimp pins onto the pigtails of the other pre-fab'd harness and pop those in in their place? Thanks! Dan Reeves RV-7A --------------------------------- No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. ________________________________ Message 5 _____________________________________ Time: 08:02:22 PM PST US From: "Fergus Kyle" Subject: AeroElectric-List: Battery switch Cheers, I want to thank all those who answered my question so quickly - Bob, Nigel, OC, Paul et al. What a library of keen experts to be able to call on! What a glorious list this is............ I have plans to make a mechanical connection to a back seat battery to allay any worries about ready availability. Many thanks again.......... Ferg Classic 914 Europa mono ________________________________ Message 6 _____________________________________ Time: 08:43:55 PM PST US From: "NEMuzzy" Subject: AeroElectric-List: Battery Switches The cheap Harbor Freight type battery disconnects are really cheap, and not near the quality of the Hella disconnect switch. If the key is flexible plastic, it is the really cheap version. The better ones are a rigid plastic. Side note: We used to build battlebots. When we hit the robots with the cheap switches, the back end would pop out, and the battery was disconnected. The Hella switches were better, but still vulnerable. The best switches that we found were the Flaming River disconnects. Model 1003 or similar. We replaced the metal handle with a drilled socket, so that we could turn it on and off with an allen wrench. Similar technique would allow you to remote mount the switch with a torque tube to actuate it. The Flaming River switch is about a $60 switch. If you want a high quality disconnect, this is a good one. The Hella switch is about $19. The really cheap ones may be OK for a garage test stand. -Norm <<>Cheers, > I have read that some are substituting race-car kill switches for >battery contactors. At present I plan to start with only about 20 amps >dynamo and regret the constant load of a contactor. > If you are operating such a devise, I would admire a short >description and appreciation of its use - and perhaps a point toward a >useful source. US or UK no problem. How much of a reach is it to get at a switch mounted right next to the battery. Harbor Freight sells a device that looks like this . . . http://tinyurl.com/2u7wgj . . . for about $6.00 . . . oops, strike that. They're on sale right now for 2.99 at http://harborfreight.com as item #92688. Marine parts dealers sell a variety of battery switches too. I'm working on the alternator drive stand and will need some high current, manual switches. I think I'll run down tomorrow and pick up a fist full. Obviously, for use as a battery contactor replacement, you want it to be within convenient reach of the pilot. Bob . . .>> ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.