Master switch on but no power

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8466
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Name: Thayne I
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Master switch on but no power

Post by 8466 »

I turned on the master and got no power, so took out battery and fully charged it but still no power. Any suggestions? Any common problems. I own a 1946 Cessna 140 with a C90 engine (Alternator).

Thayne
Happy flying. :D
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8029
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Name: Rob Ramey
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Re: Master switch on but no power

Post by 8029 »

I would check the battery solenoid which should be mounted on the aft side of the battery box. Give it a couple of taps with the handle of a screwdriver and see if that helps. They can stick sometimes.

Rob
Rob Ramey
1947 C140
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6597
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Name: David Sbur
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Re: Master switch on but no power

Post by 6597 »

This is the old style solenoid and it's on the back of your battery box, it should 'click' when you turn on the master switch. If you don't hear anything then check it for corroded contacts. It's fairly simple.
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8466
Posts: 63
Joined: Fri May 17, 2019 12:11 am
Location: N87
Name: Thayne I
Aircraft Type: C-140
Occupation-Interests: Retired Airline Pilot
Contact:

Re: Master switch on but no power

Post by 8466 »

Thank you gentlemen. We did that and no luck so we (me and my A&P) have concluded the selonoid needs to be replaced.

Thayne
Happy flying. :D
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6597
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Re: Master switch on but no power

Post by 6597 »

That's what I ended up doing....make sure your master switch ground is working first but it's a pretty easy install for the replacement.
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6643
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Re: Master switch on but no power

Post by 6643 »

Me too. After all, the original is over 70 years old...
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5115
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Re: Master switch on but no power

Post by 5115 »

David,
I like the aviation ruler. It seems like a vintage piece. Would you have a full picture of it? Just curious. 8-)
Martin Tanguay
Intl Cessna 120-140 Association - Canadian rep
C140, C-FJAR, 1946, sn:9168, O-200, ragwings
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6643
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Re: Master switch on but no power

Post by 6643 »

5115 wrote: Sat Jul 13, 2019 1:27 pm David,
I like the aviation ruler. It seems like a vintage piece. Would you have a full picture of it? Just curious. 8-)
AOPA used to send one out every year when you renewed. Over the years there have been a few "updates", but they're all similar. If you want one I'm sure I have a spare I could send you. (Don't everyone else respond with "me to," please.)
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