Master switch on but no power

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Master switch on but no power

Post by 8466 » Fri Jul 12, 2019 10:41 am

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

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8029
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Re: Master switch on but no power

Post by 8029 » Fri Jul 12, 2019 11:32 am

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

6597
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Re: Master switch on but no power

Post by 6597 » Fri Jul 12, 2019 3:01 pm

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
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Joined: Fri May 17, 2019 12:11 am
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Name: Thayne I
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Re: Master switch on but no power

Post by 8466 » Fri Jul 12, 2019 3:41 pm

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

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Re: Master switch on but no power

Post by 6597 » Fri Jul 12, 2019 5:30 pm

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 » Sat Jul 13, 2019 7:10 am

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 » 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-)
Martin Tanguay
Intl Cessna 120-140 Association - Canadian rep
C140, C-FJAR, 1946, sn:9168, O-200, ragwings

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Re: Master switch on but no power

Post by 6643 » Sun Jul 14, 2019 8:20 am

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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