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I'm experiencing an issue with my RAV4 not charging properly. It seems to be backwards.....

When first cranked up it shows 14.1V. When driving, it drops to 12.9V. When I take my foot off the gas and coast to a stop, the voltage goes back up to 14.1

The battery is only a little over 1 year old.

What is wrong with this charging system?
 

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Completely normal on most cars. There is nothing wrong.

When your alternator puts out less than 13 vdc, you have a problem.

Enjoy your ride.
 

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Charging systems for batteries in vehicles change the voltage to compensate for changes in load on the system and for alternator output. Seems strange at first glance, but when the vehicle has just been started the system charges at full or near to full output to recharge the battery after the heavy current draw used to start the vehicle, and when alternator output amps decline when the engine rpm drops the system compensates by increasing the voltage in order to keep the battery charged. An electrical engineer such as Dr. Dyno may chime in to explain further.
 
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