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10yr old L300 alternator

10yr old L300 alternator

Damage can be seen on the cracked cover and corrosion in various places. I suspect electrical/electronic damage occurred at some time but not enough to replace sooner.

Update 2/15; although the replacement alternator output 14.56v on cold engine start up (measured after initial installation 7/13), the 2nd battery failed in Jan/15 (after 5.5 yrs) and a new A-z Duralast displayed different (higher starting) voltages. New battery; standing voltage - 12.74v, cold engine alternator output - 15.04v, warm idle - 14.4v. With each new battery (both Duralast), cold and warm weather always had a higher starting speed. After a year or so using remote start (or manual) the starter turned over a bit slower with remote start failing to get the engine to run in freezing temps where I would have to manually turn and hold the ign switch just a little longer for a normal start. The difference in battery power was never noticed until freezing temps. During one subfreezing day with a new battery I tried remote starting and was pleasantly surprised to hear the engine turn over quickly and fire up. I'm lead to believe the original alternator was slowly deteriorating and may have caused the 2nd battery premature death (5.5 yrs of an 8 yr warranty).



Super Member

Registered: January 2006
Location: NYC
Posts: 41,060
Date: Wed, July, 31, 2013
Keywords: 10yr old l300 alternator

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