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20A should be more than adequate. Only reason for the caution is that some have eliminated the separate contactor, when using a starter that has a built-in solenoid (that can on the side of the starter motor) that both moves the pinion out, and provides the high current connection for the starter. Those can stress a typical 10A switch.
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https://m.grainger.com/mobile/produc...fc=MWP2IDP2PCP I think I might use one of these with the “momentary on” for the starter and the “on” position for the ECU master of the SDS EI. I will have to check if the “on” stays on while the starter is engaged though or that obviously won’t work. |
I wouldn't think the switch in the cockpit would see more than about 4 amps.
Looking at the wiring diagrams, it looks to me like the only current going through the start switch in the cockpit is from the 12vdc from the "Start" circuit breaker, through the switch, then coil of the starter contactor, and then to ground. So, discounting any resistance of the wire, the switch, and the circuit breaker and their connections, the current in the circuit would only be 12vdc divided by the resistance of the coil. I was looking at a popular starter contactor spec sheet today. It listed the coil resistance at ~3.5 ohms. That's less than 4 amps, nominal. |
Keyed OFF/ON L/R
I've had a keyed switch in the -7 and kept it that way after the panel upgrade. I thought about going to a push button but that would have required 2 more switches for the Mags and possibly another solenoid. I'm not sure the "failure rate" on the Keyed Cessna type switches are that bad. The key is also the same key that opens my canopy so there is that. About the only complaint I have is that if you have too much "stuff" on your key ring it will flop around when you do aerobatics, so I do agree with that. I only have the 1 key on mine so it doesn't bother me. I did change the contacts at around 700 hours. I think it comes down to a personal preference again. I think the next plane will have a push button with e-Mag switches.
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Larry |
Is there a circuit diagram that shows how to modify a key-switch system to push button?
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How you do it in your aircraft is going to depend on a couple of different things. If really want some help with it, PM me and I can give you some ideas. |
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