Sunday March 11th, 2007|
Wired Mags, Starter Solenoid
Ok, on with some wiring. I decided to get the mags wired up. This is the left mag. The white wire/blue terminal is the ground wire. The red terminal is the shield. If you're not familiar with how mags work, they failsafe to being hot. In other words...the way you 'turn off' a mag is to ground it. If the wires fall off/fail the mag will still work but you should notice the missing wires during the runup when you do the mag check.
I also wired up the key switch and the starter solenoid. There are actually two solenoids in the starter system -- one on the firewall and one on the starter itself. It would be possible to eliminate the one on the firewall but that would mean that I would have a 'hot' wire running to the forward part of the engine all the time. Anyway...I still need to wire up the big fat wire. I did try turning the key switch to make sure the solenoid was closing and opening the circuit. Yep...it works. At this point I'm pretty much leaning against installing a starter light but I always reserve the right to change my mind.
I received an e-mail from a fellow builder about the jumper on the switch. You need the jumper if you only have one impulse-coupled mag. The jumper disables the non-impulse-coupled mag during startup. Since I have two impulse mags I removed the jumper. The jumper would not create any problems, it would simply mean that I would be starting on one mag. I removed the jumper before the first engine start, but neglected to mention it on the site. Thanks for the heads-up, William.