alternator gauge reading

[curb]

ok people here's one that baffles me
wonder if the alternater is giving me signs of tiredness?
the engine starts on first turn but the meter on the dash goes down to about half way. it then remains there with the engine ticking over then gradually creeps up to about 3/4 then stays there thats fine
if i rev the engine the gauge goes up quicker than if left on tickover
my first thought was a battery was duff or that the belts loose
as i fitted a new battery about 18months ago and the 2nd battery was atleast 10 years old i replaced the 2nd battery and replaced both belts
tensioned the belt correct but the gauge still creeps up slowly even with new battery and belts
(it,s acting like an old fashioned dynamo) but only on first start.
the rest of the time it shows 3/4 charge it,s not flickering when i put on the indicaters or lights or heater and the batteries remain charged
anyone else had this?
i know u know
thanks

[Albannach]

It's a twenty year old meter, don't trust it.

Test your charging system properly and have your batteries high rate discharge tested. You need to check both of them; replacing just one battery on a dual system is daft.

[curb]

for u techies

for more info
the first battery i replaced about 18months ago
standing at the front of the car with the bonnet up it was on the left side
replced from a toyota dealer (yasuma i think but without the charge indicater black/green)
the 2nd battery was on the right(from milners with charge indicater black/green) and that one still remains green
hope this helps
i know u know
thanks

[curb]

It's a twenty year old meter, don't trust it.

Test your charging system properly and have your batteries high rate discharge tested. You need to check both of them; replacing just one battery on a dual system is daft.

ok no prob but in all fairness the 2nd battery gave no indication of failure
still green on charge indicater
so apart from me being "daft" after having both batteries tested at toyota
they repaced 1
maybe i have a "claim"

[Albannach]

ok no prob but in all fairness the 2nd battery gave no indication of failure
still green on charge indicater
so apart from me being "daft" after having both batteries tested at toyota
they repaced 1
maybe i have a "claim"

Doesn't matter, I'd have replaced them both.

You still need to have the charging system and both batteries tested to see if there is an issue.

Claim for what?

[s car go]

Doesn't matter, I'd have replaced them both.

You still need to have the charging system and both batteries tested to see if there is an issue.

Claim for what?

Albannach is quite correct,replacing one battery is false economy.When the second battery fails it will draw from the good one and the first you will know is when your new battery starts to fail.You now need to buy two new batteries.At this point you feel daft,and wish you'd bought two new batteries!

Regards

Mark

[Morango]

they dont have to be new at the same time, you may get lucky and just replace the dud one but check them both, an 18 month one and a new one will be pretty much the same, there never identical anyway