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allt troubleshooting.

Discussion in 'XJ Technical Chat' started by cejatag1, Jun 2, 2009.

  1. cejatag1

    cejatag1 New Member

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    i just bought 81 Xj750 bike and the Previous owner said the battery was new but its slowly losing charge over a day or two of not riding..so i was figuring either the battery or the charging system was to blame.. so my question is can i check the alt the same way you would ghetto check a car alt (just pull the battery and see if it keeps running) or is there another way o checking it? and how can i check if my battery is f*@$% ?
     
    cejatag1, Jun 2, 2009
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  2. stereomind

    stereomind Active Member

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    Take the battery to an auto parts store. They should have the equipment to check batteries, with and without a load. Wouldn't hurt to check the fluid level. Top off with distilled water if necessary.

    If the battery is good, but it still drains after a couple of days of not riding, your alternator probably does not have much to do with it. First and foremost, check the bike for obvious electrical "modifications" such as cut/spliced wires, suspicious tape jobs, any additional electrical equipment, etc... Something may be pulling on your battery even when the key is off (nothing should).

    To check the alternator, put a voltmeter on the battery posts. Start it up. At about 3K RPM, your alternator should be making over 14V.

    It helps to know a bit more about the bike... Mileage, condition, etc..
     
    stereomind, Jun 2, 2009
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  3. Tiny

    Tiny Member

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    Your solution is quite simple and looking you right in the face. DON'T GO A DAY WITHOUT RIDING. :)
     
    Tiny, Jun 2, 2009
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  4. Robert

    Robert Active Member

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    EMPHATICALLY NO!!! Do NOT do that, you will fry the regulator/rectifier diodes!!!
    Use a multimeter set on volts and check the static voltage (engine off, key off). Should be 12.8VDC or higher.
    Start the bike and you should see the same voltage.
    Bring up the RPMs to 2000+ and you should see 14.5 +/-0.3VDC (14.2-14.7).
    Anything else indicates trouble in the charging system and you will need to check other components.
     
    Robert, Jun 3, 2009
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