Alternator Problems Really Doing My Heading

[205johnnyxsi 0]

hello i have been having problems with my alternator

 

just fitted another one today but still the bat isnt holding charge

 

i got me leccy tester out and tested the bat when running was only reading 12

 

then i used the positive on the battery and then used the negative on my alternator and i was getting a reading of 13 and higher when i revved it

 

i cant work it out in all fairness

 

any more information needed just ask and ill try and help a little bit more

 

thanks Johnny

[Rob Thomson 6]

Is the warning light on? Does it come on before you start the engine?

[205johnnyxsi 0]

Yeah mate before i start it it comes on but goes off when it is started

[jackherer 543]

i got me leccy tester out and tested the bat when running was only reading 12

 

then i used the positive on the battery and then used the negative on my alternator and i was getting a reading of 13 and higher when i revved it

 

Are you saying you're seeing 12v with both positive and negative probes on the battery but when you put the negative probe on the alternator you then see 13v? If so check the earth on the gearbox at the other end of the battery negative cable.

[205johnnyxsi 0]

someone actually told me that the other day i see what i can do 2mora thanks mate

[jackherer 543]

If I understood what you said correctly it has to be the earth, the only other thing it could possibly be is the battery negative clamp itself, if you still have the standard screw on thing cut it off and fit a proper clamp.