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rnjcurtis(at)charter.net
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 Posted: Sun Aug 02, 2015 3:09 pm Post subject: AeroElectric-List: Contactor or master switch problem? |
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I have been having some starting and electrical issues which I think may involve the master switch or the battery contactor.
My son and I were going out flying one day last week, had preflighted the plane, and after we pulled the plane from the hanger we switched on the master switch. The electronics came on briefly and then faded away. There was no power for the starter. I thought that was odd because the plane normally has charger attached while in the hanger. The Odyssey specific charger indicated the battery was charged. After a quick trip home to find a volt meter we tested the voltage which was 13+v. We had the charger on while we gone so the reading was skewed because of that. We pulled the plane out and the electronics and starter worked normally.
On Sat., I flew 8 trips of Young Eagles with no starting or electrical problems. After the event was over, a trip to the fuel pump had the electronics working but the starter contactor clicking but no prop rotation. I cycled the master switch several times and finally the engine turned over like nothing was wrong. I have a 1200 nm trip coming up soon so I need an answer so there are no problems along the way.
The battery is a PC680 about 2 years old. The master switch (Carling) and battery contactor (B&C) are about 7 years old and have around 630 hours. Apparently the volts and amps are there but getting choked off before they can do their work. Right now, my thought is to replace them both, but especially the master switch, due to my impending trip. Any thoughts, better ideas or am I missing something?
| Quote: | | Quote: | I had a similar problem a couple of years back. I would have to turn the master on and off several times to get power to the starter and electronics. Once the power came up it would run flawlessly until the next time I tried to start it.
The problem turned out to be a bad, internal contact corrosion, master solenoid. I replaced it and the problem went away completely. After I replaced it I sent the defective unit to Bob N and he dissected it, took pictures, and posted on this forum. It is likely that you have a similar problem.
Roger
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sun Aug 02, 2015 7:14 pm Post subject: Re: AeroElectric-List: Contactor or master switch problem? |
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My guess is the contactor is at fault. Once a contactor is energized, it does not take as much current to hold it closed. If the master switch conducted enough current to energize the contactor, then the switch should be able to hold the contactor closed. But if you replace both, there is no guessing.
Also check the terminals on the fat wires, including the battery ground.
Joe
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