Problems start riding mower

jrmccoyMay 4, 2014

I am having a problem starting my Husqvarna riding lawn mower. When I attempt to start it, I here a loud buzzing noise in the ignition switch, but it won't turn over. I can however jump start the mower. I ran it for a good 15-20 minutes yesterday to make sure the battery was charged up. That appears to have made the buzzing noise louder. Any thoughts?

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jrmccoy

Follow up: The buzzing noise may not be coming from the ignition switch. It may be the solenoid. Again, if I jump start it, it will start.

    Bookmark   May 4, 2014 at 4:00PM
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bill_kapaun

Get the battery charged & Load Tested.
You didn't provide any model # of your mower, but many of these only have a 3 AMP charge system. That means it'd take about 10 hours to charge a fully run down battery.

What likely is happening-
The battery has enough charge to activate the solenoid-
As soon as it tries to crank the starter motor, it pulls the battery voltage so low, the solenoid drops out-
Battery voltage then increases enough to activate the solenoid-
Repeat......
Kind of a machine gun effect.

This post was edited by bill_kapaun on Sun, May 4, 14 at 16:26

    Bookmark   May 4, 2014 at 4:24PM
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jrmccoy

Thank you. I'll try that. That does sound like the most plausible explanation.

    Bookmark   May 4, 2014 at 4:32PM
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jrmccoy

Ugh. Battery is good and fully charged. What you mentioned above fits the description. Any thoughts why jumping works? It seems to be some other electrical related issue.

    Bookmark   May 4, 2014 at 6:54PM
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mownie(7)

If the battery is indeed fully charged and still acting as you described, the next step is to clean ALL the battery cable ends by taking them loose from where they are fastened and wire brushing or sand papering till clean and bright.
This means ALL battery cables where they connect to the frame (ground side) and the starter solenoid (hot side).
Disconnect the battery negative cable at the battery before you begin messing with the other cable ends. Leave the battery negative cable disconnected from the battery until you have finished cleaning and retightening all the other cables.
Reconnect the battery negative cable last.

    Bookmark   May 4, 2014 at 7:46PM
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jrmccoy

Thank you! Cleaning up the connectors did the trick

    Bookmark   May 5, 2014 at 11:14AM
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mownie(7)

The same principle that Bill explained was doing it. The continuity afforded by the loose or dirty connection points simply could not carry enough "juice" to operate the solenoid AND power the starter all at the same time.

    Bookmark   May 5, 2014 at 11:47AM
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