Westwood no charge

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Steven.lincoln

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Hello all, I have a Kawasaki FH721V-BS51 mounted in Westwood V20/50 2006.
Recently replaced battery and then discovered battery not receiving charge while running. Replaced regulator/rectifier (not OEM) and retested, no change.
Stator output at full RPM is around 30VAC to regulator but only 1.8VDC output.
Regulator is bolted to engine heat shield for grounding.
Do you think I bought a duff regulator or could I be missing something?
 
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txmowman

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Where are you measuring the DC output? If at the B+ terminal of the regulator, then you should have at least battery voltage. Do you even have power to the regulator?
 
ILENGINE

ILENGINE

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Are you getting battery voltage to the regulator. Because some will not turn on without a certain input voltage.
 
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Steven.lincoln

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Thank you for the replies. I was not getting battery voltage at the regulator and have since discovered the mowers charging system is fused, I’ll check that next.
 
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Forest#2

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ILENGINE said:
Are you getting battery voltage to the regulator. Because some will not turn on without a certain input voltage.
Click to expand...
Because some will not turn on without a certain input voltage.

Strange but true.
If a external voltage (usually battery voltage)is not detected by some voltage regulators used on Lawn tractors the regulator will not turn on and no or very low DC voltage will be read on the regulator output. When I see such I jumper the regulator output directly to the pos post of the battery USING A 20 AMP IN-LINE FUSE HOLDER. This bypasses the tractors wiring harness/fuse and ignition switch.
Always use a in-line fuse when doing such.
 
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Steven.lincoln

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Hello all, I’d like to thank you for your replies and give you an update on the fault. The machine owner had let the battery go completely flat and attempted to charge it but connected the charger backwards. The battery took a charge but now had reverse polarity, if that’s possible. I confirmed this with a multimeter across battery terminals. This I believe damaged the regulator diodes which I confirmed following regulator resistance tests in service manual. Also found charging circuit 20 amp fuse Melted to the fuse block. I bypassed the fuse block with an in-line 20 amp fuse which solved the charging issue.
 
Tiger Small Engine

Tiger Small Engine

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Steven.lincoln said:
Hello all, I’d like to thank you for your replies and give you an update on the fault. The machine owner had let the battery go completely flat and attempted to charge it but connected the charger backwards. The battery took a charge but now had reverse polarity, if that’s possible. I confirmed this with a multimeter across battery terminals. This I believe damaged the regulator diodes which I confirmed following regulator resistance tests in service manual. Also found charging circuit 20 amp fuse Melted to the fuse block. I bypassed the fuse block with an in-line 20 amp fuse which solved the charging issue.
Click to expand...
A strange chain of events. Glad you got it sorted out.
 
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