Alternator Not Charging Underload

[danny9880]

howdy all

av been having some probs with my alternator it charges fine with the lights and stereo (amp and sub included) but when i switch on the heated seats and heated windows etc..... underload it drops between 12.5 - 13.0 volts

alternators not that old and still got a warrenty so can just take it back and get a replacement.

any ideas?

the only thing i can think of is just after the alternator was fitted my battery negitive cable snaped ,my mistake [img]/sad.gif[/img] and i didn't buy another 1 just extended it with a 30amp wire which is alot smaller than the negitive cable , but worked for a good 4months could that effect it over time??

[tb303]

hmmm
i have a 120amp alternator on my car. fan is always on, and when i switch on heated seats or defogger, voltometer shows even 10volts and a very dim battery light appears on the dash. i think it has something to do with the loom in the car and to the dash.
because you should measure the battery output with a multimeter straight from the battery as i am pretty sure it will show around 13v which is not bad at all.
i think the voltometer has to be connected somewhere else than the loom. maybe a battery feed with relay or something in order to avoid melting the wire? dunno not sure about this....

maybe someone can help?

[danny9880]

i took it to a garage for a check up he asked me to turn everythink on , he says straight away the alternators nacked, i asked him what volts it was putting out 12.5 13.0 i would of thought that if everythink was switch on the volts should drop anyway but not sure. i should off gave the car a rev coz idle runs up and down a little, think i will be ok

just wanting to know if any 1 has had the same prob

[billys valver]

<!--QuoteBegin-danny9880+--><div class='quotetop'>(danny9880)</div><div class='quotemain'><!--QuoteEBegin-->i took it to a garage for a check up he asked me to turn everythink on , he says straight away the alternators nacked, i asked him what volts it was putting out 12.5 13.0 i would of thought that if everythink was switch on the volts should drop anyway but not sure. i should off gave the car a rev coz idle runs up and down a little, think i will be ok

just wanting to know if any 1 has had the same prob<!--QuoteEnd--></div><!--QuoteEEnd-->


12.5 to 13.0 volt's under load is fine, is it giving u any problems?

[danny9880]

<!--QuoteBegin-billys valver+--><div class='quotetop'>(billys valver)</div><div class='quotemain'><!--QuoteEBegin-->12.5 to 13.0 volt's under load is fine, is it giving u any problems?<!--QuoteEnd--></div><!--QuoteEEnd-->

at the moment no, been out a few times for about 20mins with lights,spot lights and stereo on (not loud tho) and start fine the next morning.

a couple of weeks ago , i took the car for its MOT and it failed on the headlights been to high up (lucky eh!! nah its my tender loving care [img]/smile.gif[/img]


so when i got back home i turned the lights and the spot lights on but the engine was off i had been playing around for about 15mins when i came to turn the engine over it tryed to start but didn't have enough power in the battery i thought that it was abit weird the battery going dead so quick, but after thinking it happened a while back but this time ad had the stereo on, break down service jumped it off just after a few sec's off charge

and now the garage is saying i need a new alternator , maybe am just been paronoid or maybe try turning the engine on before assing around with lights and stereos [img]/smile.gif[/img]

[billys valver]

<!--QuoteBegin-danny9880+--><div class='quotetop'>(danny9880)</div><div class='quotemain'><!--QuoteEBegin-->at the moment no, been out a few times for about 20mins with lights,spot lights and stereo on (not loud tho) and start fine the next morning.

a couple of weeks ago , i took the car for its MOT and it failed on the headlights been to high up (lucky eh!! nah its my tender loving care [img]/smile.gif[/img]


so when i got back home i turned the lights and the spot lights on but the engine was off i had been playing around for about 15mins when i came to turn the engine over it tryed to start but didn't have enough power in the battery i thought that it was abit weird the battery going dead so quick, but after thinking it happened a while back but this time ad had the stereo on, break down service jumped it off just after a few sec's off charge

and now the garage is saying i need a new alternator , maybe am just been paronoid or maybe try turning the engine on before assing around with lights and stereos [img]/smile.gif[/img]<!--QuoteEnd--></div><!--QuoteEEnd-->

to tell u the truth, it dont sound like u have an alternator prob
it could just be a battery on its way out

[danny9880]

maybe yeah

al leave it for the moment and see how i get on

cheers for the info

cya later