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#33102 - 04/15/11 12:14 PM Starter Solenoid Screw Up
EdW Offline
Club Sponsor
Gold Pilot

Registered: 11/21/10
Posts: 1413
Loc: Just east of Graceland
My starter solenoid was working when it felt like it (would work every twenty or so tries), so I got mad and broke down and replaced it. About a flying hour later, I started getting a whine in my comms, about like a teenager being told his allowance was being reduced. I figured the capacitor on the alternator was showing its age, so replaced it. Didn't help a bit.

Yesterday I was going to go shoot some touch and goes. As soon as I turned on the master switch the prop started to turn. "Hmm," I thought, "That ain't right."

I opened the oil door, and the first thing I saw was that the insulation on the battery cable had melted, and was too hot to touch. When I opened the battery box, the lead terminal on the positive end had melted and pooled on the top of the battery. Some kinda hot, I imagine.

Apparently, my new starter soleniod shorted out internally, allowing power to the starter at all times. The noise I heard was the starter trying to be a generator, and all the confused electrons generated enough heat to damage my components.

I replaced the battery (no Concorde immediately available, so Gill), replaced the positive cable, and put the old, intermittent solenoid back on until I can get a replacement. Whine disappeared, and everything else operated normally. Fortunately, nothing else was damaged. Off I went, into the wild blue yonder.

Now, if I could only remember how to make them damned 'squeaker' landings!



Edited by EdW (04/15/11 12:15 PM)

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#33105 - 04/15/11 12:25 PM Re: Starter Solenoid Screw Up [Re: EdW]
KevinMcP Offline
Gold Pilot

Registered: 08/13/10
Posts: 1634
Loc: Hapeville, GA
I didn't think those kind of things happened to maintenance types... Everytime I have an issue it clears up when I try to show it to a mechanic.
_________________________
"A smart man learns from his mistakes. A wise man learns from the mistakes of others" -Anonymous

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#33114 - 04/15/11 12:59 PM Re: Starter Solenoid Screw Up [Re: KevinMcP]
joelaff Offline
Bronze Pilot

Registered: 04/08/11
Posts: 626
Loc: Missouri, USA
Makes you think "clear" ought to be required before turning on the master switch... I suppose not a bad plan in case the ignition switch has failed as well.
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#33180 - 04/15/11 09:15 PM Re: Starter Solenoid Screw Up [Re: KevinMcP]
EdW Offline
Club Sponsor
Gold Pilot

Registered: 11/21/10
Posts: 1413
Loc: Just east of Graceland
Originally Posted By: KevinMcP
I didn't think those kind of things happened to maintenance types... Everytime I have an issue it clears up when I try to show it to a mechanic.
Ever hear of Murphy? I married their red-headed daughter.

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#33187 - 04/15/11 09:29 PM Re: Starter Solenoid Screw Up [Re: EdW]
Skyhawker04 Offline
Safety Pilot

Registered: 03/24/11
Posts: 73
Loc: Missouri
Check under the ground lug Ed. Make sure you did not melt a bigger hole.
_________________________
Craig A&P IA
Cessnas 2 Oshkosh
1961 C-172B
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#33204 - 04/16/11 12:11 AM Re: Starter Solenoid Screw Up [Re: Skyhawker04]
EdW Offline
Club Sponsor
Gold Pilot

Registered: 11/21/10
Posts: 1413
Loc: Just east of Graceland
Originally Posted By: Skyhawker04
Check under the ground lug Ed. Make sure you did not melt a bigger hole.
I did, all ok

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#33221 - 04/16/11 09:37 AM Re: Starter Solenoid Screw Up [Re: EdW]
November X-ray Online   content
Club Sponsor
Gold Pilot

Registered: 08/15/10
Posts: 2178
Loc: Brookshire, Texas, USA
Don't you just hate it when that happens!
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www.cessna172club.com

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#33235 - 04/16/11 02:05 PM Re: Starter Solenoid Screw Up [Re: November X-ray]
vettdvr Online   content
Club Sponsor
Diamond Pilot

Registered: 06/24/10
Posts: 7588
Loc: Slidell La
I had that happen in a car but caught it before damage. You have done some (don't know how much) damage to your starter also. The solneoid you bought was clearly defective and you need a new one to repair this problem

Remember NEW does not = GOOD. It is possible to buy new, defective parts.
_________________________
Vettdvr

Single/Multi/instrument/type/commercial But then I am still learning.

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#33245 - 04/16/11 04:53 PM Re: Starter Solenoid Screw Up [Re: vettdvr]
JohnS Offline
Safety Pilot

Registered: 10/11/10
Posts: 25
Loc: Wichita, KS
Double check the solenoid! A starter solenoid should energize and release....a master or battery solenoid is designed to stay closed. They both look similar, if not identical. One way to tell is if they are rated "intermittent duty" for starter or "continuous duty" battery.
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