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I have a 2005 4.0 V6 D/c Hilux.
On a recent trip the alternator light came on(the red battery on the dash) expecting the battery to die I was surprised when I got home and all was working fine, and has been for the last week and a bit.
I went to a auto electricians to have the unit tested. All tested 100% they mentioned that the voltage regulator might be giving a false signal to the dash.
They also mentioned that they have to remove the alternator and see if the voltage regulator can be replaced. Apparently on the Denso models they can not and then its a new alternator!!!
if its a Bosch they can replace just the regulator.
Any had this problem before?