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SRTsFZ6
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2018/09/09 08:16:44
Rjrottari

Reversed Battery in Husqvarna tractor

Son changed battery in Husqvarna tractor. I didn’t know it was reversed. Replaced starter and coil. Then I saw what he did. Reversed leads to correct polarity. Now as soon as turn key on it blows the fuse. Read it could be a shorted stator? Put meter between red stator lead and frame and it reads dead short.
10 comments Leave a comment
AVB
It is possible but it can voltage regulator or the smart switch if present. All depends on the your mower and engine electrical setup. These several stator setups we would also need to determine which was used. If the mower has an electric PTO it cam be shorted but I am assuming that even if you have an electric PTO you have not tried engaging it during the time the battery was reversed.
 
Need the mower and engine model numbers to further suggest items to check.
 
BTW just reversing the voltage will not hurt the starter; it will just turn backwards as it is just a DC motor but I don't know why you were replacing the starter in the first place.
2018/09/09 10:34:48
Rjrottari
It’s a Briggs and Stratton 441777-0284-E1
2018/09/09 10:54:49
Rjrottari
Mower is a YTH2242T
2018/09/09 10:57:27
AVB
Although Briggs has the engine list with a dual circuit stator the mower's electrical showing it with the 16 amp stator which makes more sense since you have an electric PTO clutch pulls up to 7 amps plus have fuel shutoff solenoid which pulls another 1 to 2 amps.
 
Now if you are checking the red wire at the stator regulator it will read short if the ignition is off. Disconnect the battery and place the ignition is run position then test the red wire. This tests the output of the voltage regulator. There should two other same color going the the voltage regulator from the stator, disconnect them and test the each to ground. There should infinite resistance, any indication of a short means the stator is bad.
 
Also disconnect both coils kill wires and test the harness as it contains diodes that might be shorted. Use you meter's diode test function for this. There is usually two in this harness and if either one is short or leaky it will cause igntion problems.
2018/09/09 11:23:58
Rjrottari
Ignition on. No battery red wire shorted to chassis
2018/09/09 11:41:06
AVB
Okay disconnection other wires to the regulator and retest if still a dead short then replace the regulator.
2018/09/09 12:30:05
Rjrottari
All wires disconnected . Still short from red to block that’s on red wire that goes up to stator
2018/09/09 16:45:15
AVB
Sounds you do have the low amperage dual circuit stator like the one below.

If so then you need to pull the flywheel for the next test. This would the testing of the diode (lump) in the red wire see if the it is shorted and that none the windings are burnt.
 
Personally I don't know why they would used a dual circuit on a mower with an electric PTO as just don't produce enough current to operate the PTO, the fuel solenoid, and recharge the battery, all at the same time.
 
I would thought the stator would have been the following one (white, yellow, or black wires).

2018/09/09 17:10:44
Rjrottari
Sorry to be a pain. The red wire I was on traces back to a harness and the traced short to th fuel cutoff solenoid. If I unplug connector from solenoid short goes away.
2018/09/09 18:16:15
AVB
Not a pain at all. Just hard to tell your experience level.
 
But yes these fuel solenoids do short but not normally related reverse polarity as no diode are in them. You just maybe just be a victim of a random occurrence that happen at the same time. I have replaced a few of them this year but it does sounds like you have the source of the problem. Still expensive but still better than randomly parts guessing at the problem.
2018/09/09 18:46:29

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