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  1. Re: Bad Board 
    #11
    Senior Member behaines's Avatar
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    There is a pretty good site:
    http://www.ladyada.net/learn/multimeter/
    that will explain how to use the multimeters.

    continuity and DC voltage are the ones you use the most. Some times Resistance, but not all that often.

    The reverse relay switches the direction of the field. In a shunt/compound wound motor the field helps turn the armature in a given direction. It can also be lowered to provide more power or speed. That's what card 3 does.

    In the E15 a common thing to do is reverse brake. An operator will truck around at top speed and quickly slam it into reverse to stop. What happens is the relay is connected going one direction, then flips and tries to change polarity. The problem is the armature is spinning really fast and is creating/maintaining the field. Picture standing under a waterfall trying to push it back with a garden hose. Long story short...Reverse is not a break. Stuff will break.
     
     

  2. Re: Bad Board 
    #12
    Senior Member behaines's Avatar
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    @Nick: We're posting all over each other today. lol
     
     

  3. Re: Bad Board 
    #13
    Senior Member FarmallMan's Avatar
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    LOL, yes. Great minds my friend, great minds...

    Nick
     
     

  4. Re: Bad Board 
    #14
    Senior Member housewiz's Avatar
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    Hey Matt,

    I have 3 NOS (new old stock) #3 cards. The #'s match up w/yours.

    See photo below. Send an email if interested. I would recommend two - one for a spare.

    I'll work up a reasonable price.

    Steve
    steve@housewiz.com

    IMG_6351.JPG
    Attached Images
     
     

  5. Re: Bad Board 
    #15
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    Would I be able to use there of these to make the test fuse block "behaines" mentioned?

    http://www.amazon.com/Bussmann-BP-HH...0076898&sr=8-3
     
     

  6. Re: Bad Board 
    #16
    Senior Member behaines's Avatar
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    Sure, that would work...Keep in mind that you would use it only for testing, not under real load. In other words you can't actually drive or mow with that block of fuses on there. Take 3 of them, strip the ends to about an inch of exposed copper. You can use ring connectors to hook them to the master disconnect. Then the other end to the battery +.

    Before you really start testing, verify you have 36+ at the master disconnect and 36- at the rear battery box. If you don't get 36ish (+-5V) check your battery connections. It's easy to get the 00 wire connected to the wrong spot and now you have batteries reversed. That's bad for the batteries. You can damage all 6 batteries.
     
     

  7. Re: Bad Board 
    #17
    Senior Member FarmallMan's Avatar
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    Here's how to check it out: First, write down which wire numbers go to which pad numbers. If you look closely, you will see that the wires actually have white silk-screened numbers on them. The pad numbers are on the board. Looking at your picture, the connector on wire 13 (Pad 2 looks broken). You may need to fashion a new one from a female spade terminal (use a screwdriver to open it up so it fits the board). Be careful not to cut off the wire number when stripping it to crimp on the new connector.

    Back to the proceedure: Use your multimeter in the 200 Ohm scale (or autorange, if you have that). You should have the resistances shown below. A resistance of 0 will result in no speed change. The meter showing an open circuit is a real problem because it will result in loss of field current to the motor. Open circuit is likely due to a burned trace or bad resistor. Make sure your probe is getting a good contact on the pad before determining you have an open trace. Also note that small deviations (a few ohms) from the published values are acceptable.

    Nick

    R4: Pad 4 to 5, 20 Ohms
    R5: Pad 5 to 3, 20 Ohms
    R6: Pad 3 to 6, 20 Ohms
    R7: Pad 6 to 2, 20 Ohms
     
     

  8. Re: Bad Board 
    #18
    Senior Member dh1's Avatar
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    Thanks for posting the resistor values, I was looking for that info.
    Thanks Doug from Markham Ont. Canada

    http://www.evalbum.com/3985

    http://www.evalbum.com/4400
     
     

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