2004 Raptor 50 - Yamaha ATV Forum
 
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post #1 of 6 Old 07-31-2019, 11:20 AM Thread Starter
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2004 Raptor 50

Battery keeps going dead. Tested voltage between battery positive and positive lead with key off and get 8 volts. Is this correct.
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post #2 of 6 Old 07-31-2019, 10:28 PM
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no should be 12 ish with the bike off and 13.6 ish running. if its not your stator or rectifier is bad
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post #3 of 6 Old 08-01-2019, 10:17 AM Thread Starter
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not with battery connected, with the positive lead disconnected from the battery and the meter between the positive lead and the positive terminal on the battery I get a reading of 8 volts
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post #4 of 6 Old 08-02-2019, 10:09 AM
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i am not exactly following your test. that would give you the exact same results as if the terminal was on the post.charge the battery with a battery charger until the charger says it is fully charged. hook the terminal back up and measure the voltage between the positive and negative terminal. it should be around 12.3 to 12.5 volts. start the machine and the voltage should jump to over 13 somewhere around 13.5 to 13.7. if it jumps up to the 13 or so volts your battery is bad and just taking a surface charge. if it does not jump up to 13 volts unhook the positive terminal while the machine is running. if it stays running you have a bad rectifier, if it dies you have a bad stator. also check the wiring, grounds and any fuses ( check them with a meter, sometimes they look good and are bad)
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post #5 of 6 Old 08-06-2019, 10:06 AM Thread Starter
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I am checking for a short, its a new battery. If I test between the disconnected positive battery lead and the positive on the battery I get a voltage reading indicating it goes to ground , correct . That indicates a short in the system, just wondering if the rectifier was bad would that show a short. Have not removed the battery lead while running yet.
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post #6 of 6 Old 08-06-2019, 11:01 AM
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i assumed the battery was going dead while you are running it? is that not the case. if the key is off and you are showing voltage then yes it is grounded and there is an issue. it is possible the rectifier is shorted to ground. do the test i said above and unhook the negative cable and test between the engine block and the negative post on the battery if you have voltage there you definitely have a short
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