Bridge rectifier question

Think of the bridge as a device with 4 pins with a diode in between each pin.

Measure resistance across the pins from one to another. They should read high one way and not so low the other... If any combination of pins read <100 ohms in both directions then replace the device.
 
http://www.pinrepair.com/begin/index.htm#howdmm

...then scroll down a bit to the heading "Testing Bridge Rectifiers"

If you find it's bad: Don't worry so much about the part number on the original. Substituting bridge rectifiers is generally much simpler than with transistors. Typically all you need is any bridge with an adequate PIV (peak inverse voltage, usually 200V for US use) and a sufficient current rating (likely 20A in your case). Most often, anything with the correct packaging (size and shape) will have good enough specs.

If it's the "big square" kind with 1/4" QD terminals, 400V/35A bridges seem to be pretty common, and should work just fine.
 
Most meters have diode check on them. Use diode setting to check each of the 4 diodes. You should show about half a volt one way and open when you reverse the leads. Google search and you will find more in depth explanation on the process.
I have a few different type BR in stock. Let me know if you have wire lead or QD terminals on yours.
http://www.twistywristarcade.com/38-bridge-rectifiers
 
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