18 replies to this topic

[dklawson]

Regardless of the alternator type you can make these measurements at the battery. Check the "static" voltage across the battery with the engine not running. Start the engine and repeat your measurement across the battery. You should see about a 1.5V increase over what your static measurement was. The exact value isn't carved in stone but it should be an easily measurable increase... yet never exceed 15V on a street car.

[Bounce]

well thats my prob sorted then, when the ignition is turned on its 12v but when the engine is running i only get an output on the alternator of 0.5v.

then again could change it to find that its a fault in the loom.

As you can see, he'd already done this, I was describing the next step as to rule out the alternator. If the voltage across the alternator is good he'll have a high resisitance/open line in the loom somewhere.

[Noah991]

Thanks for the inputs, trying to find a multimeter now.. Will let you all know.

[On_fire]

it might of jus been becuase i`ve had this prob b4 or weather i jus thought it was the obv answer but i would have sed at the beggining that it would be the alternator which should have been checked first seein as there was no electrical prob found when the car was taken to be checked.

But as i sed it might have jus been me