alternator question

[egg_83]

What should a alternator output be on a 3tc?
My car went flat the other day (left my lights on:embarassed:) so iv charged it and now the volt meter in the car is now only reading about 13v whilst driving and drops below 12v if i have my lights on and indicator on.
Volt meter was on about 14v before the battery went flat
Would my alt be on the way out?
Any other ideas?

[all torque]

Could be a slightly lose belt.

[egg_83]

Could be a slightly lose belt.
Nope iv made sure of that

[all torque]

Dodgy connection/loose wire? Voltage regulator, perhaps?

[egg_83]

yeah i was thinking the reg

[3s-86]

Hey mate

Get hold of a multimeter and check voltage at alternator Pos+ terminal
and then at the Battery + terminal.
Voltage at the alternator should be 13.8 > 14.5 volts,
Max voltage difference between them shouldn't be more than .2 to .5 volts.