Question about 2007 Triumph Thruxton 900

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Battery keeps going flat .. lights dont go brighter when revd

Battery keeps going dead .lights dont go brighter when engine is rev ,d .. no my 2004 thruxton

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Hi
That sounds like the regulator / rectifier has blown
Check all connections & wring between battery & reg / rect.

Ride Safe
bike-Doc

Posted on Jun 04, 2010

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On my 2007 Thruxton.. I had the same issue.. Spoke to dealer... they checked it and found no draw on battery.. they suggested if I don't run it at least once a week to keep on trickle charger.. so thats what i do. it is never been a problem again..

Posted on Oct 24, 2011

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I have a 1998 Buick Lesabre how do u know when the alternator is going bad.


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Please rate this solution. Thanks!

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Battery problems


After you start the bike put the headlight on high beam. Rev the engine and the light should get a bit brighter. If it stays the same or dims the battery is discharging.

If you have a meter, take off the seat and start the bike. Place the meter in DC Voltage mode and place the red probe on the + side of the battery and the - probe on the negative side. It should read 12v to 14v. Start the bike. The voltage should rise to over 13V or at least higher than it read when the bike is not running. If you rev the engine the voltage should also rise a 1/2 volt or so.

If the voltage remains the same or decreases you have a charging problem. Here are the two most likely fixes.

Tighten the battery connections.
The rectifier is not working. It is located on the right rear of the bike under the seat fairing.The rectifier converts the AC voltage coming out of the alternator to DC voltage which is what the battery needs to stay charged.


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