GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Fri Dec 18, 2009 10:45 am Post subject: AG5B wiring question: SOLVED |
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As it turns out, I had all the wiring correct. What I didn't know was, the 7 ground wires on the firewall side need to be grounded to the battery . . . NOT THE AIRFRAME. The AG depends on ground wires coming through the big cannon plug in order to turn things on inside. And, using the vacuum filter . . . . well, what can I say? It's a crappy design at best. As soon as I created a common ground and ran that wire to the battery, everything worked.
And, for all you AG owners out there, remove the fuse to the hobbs meter and then test for voltage on the hobbs. It's still there. Now, pull all of the circuit breakers and fuses. It's still there. I've tried tracing down that one. I got lost in all the un-numbered wires.
And, another 'for all you AG owners out there.' if your fuel gauges don't work quite right, it's the grounds riveted to the rib opposite the fuel tank sending unit. The plating on the rib prevents a very good ground. NOTE: AGs don't use the fuel tank for ground. Just remove the ground, cut near the rivet, and install a new ground next to it with a PK screw and tinnerman. Remember to sand off the coating.
I have a dedicated ground buss in my plane. Under the glareshield, away from the corrosive conditions in the engine compartment. I have one wire from the ground buss to the engine mount. I really can't see running all those grounds through the firewall.
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Gary
AuCountry Aviation
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