15-16V idle :D 12.5 under load :'(

[Sami]

Just fitted a new alternator, bushes in the old one were buggered.

Now its running nearly 16V on idle but when I turn everything on it it drops right down to just over 12??

If I rev the engine its fine lights get mega bright way brighter than with the old alternator but only if i rev it?

Any thghts?

 

[bmh.01]

16v is far too much, should be looking for circa 14.4v when charging. Used alt I take it?

 

[Sami]

Think it was 15.75ish on idle charging or over 15 anyway.

And yeah 2nd hand alt how'd you guess? Checked the bushes before I slapped it in though and it all looked kosher...

 

[Sami]

Also fitted a new aux belt while I was at it, don't think that would make a difference for the worse thou?

 

[bmh.01]

Nah just a guess on it being 2nd hand, might have a shagged voltage regulator. According to the haynes manual when loaded it should be between 13.2 and 14.8v so it doesn't look too promising tbh.

 

[Sami]

b****cks which part is the voltage regulator?

 

[Sami]

*bump*

 

[Sami]

Ok the battery is also pissing out fluid that can't be good surely??

 

[bmh.01]

Its pissing out fluid because its overcharging and boiling the electrolyte.
New alternator needed, the voltage reg is an internal part of the alternator, you might/probably need a new battery now too if its buckled the plates.