Hi im having problems with my altinator the light is on in the dash and my battery is going flat in one day. The altinator is charging at 8 and a half the car is an eb ford falcon station wagon 92 model the motor is 4.01. could you please tell me where the fuses are for it as i cannot find it in my manual. Regards Jenny Tierney

What model and make is your truck?
Older vehicles differ widely from later ones. Is the regulator separate from the alternator? If so, you might need to replace the regulator.
On some vehicles, the regulator was booted by the indicator lamp on the dash. If the light does not work (blown), the alternator does not charge.

the dashlights should go off when it starts , that should be normal .
sounds like your batterie is flat. try to jumpstart it or charge the batterie overnight and try to start it.
if it runs after that and the dashlights dont turn off it could be your altinator. use a multimeter, set it to 20 v and connect it to the batterie while the engine runs, it should get more than 13,5 v. if you dont have a multimeter go to aany carbatterieshop and ask them to test yout altinator. its free usually. also let them check your batterie.

Used parts such as starters and altinators don't last. It might **** but it sounds like you need to buy a new starter,altinator, and battery. Or just start with buying one at a time.

Battery might have died cause the altinator is not charging 14+V Please charge the battery, donot boost the dead battery. After charging the battery check the altinator output.

Make sure battery has a full charge and battery connections all good. Voltage and ground are both important. You could use a test light on the fuses in the fuse box to check for voltage. Some fuses are hot all the time, some go hot with the key on.
You may have to check feed to and from ignition switch.

im not to sure about what the muffler looking thing is.. but i would suggest doing a battery hydrometer test on your battery to make sure the cells are all good.. if one is lower then the others the battery is garbage... hopefully it is servicable battery so you can check it.. Also thinking alternator possibly...

Make sure the alternater belt is the correct tension....If its been recently replaced, it may have been a size too big. Have you also had the regulator checked for output?
Regards Johngee10

Sounds like a charging system issue. Just because the alternator itself tested fine doesn't mean it's getting power to the car and battery. Charge the battery and start the car (with everything connected normally, including alternator). While car is idling, disconnect the battery (negative post wI'll do). If car dies, there's a problem with the alternator wiring/harness. Once the vehicle is running, the alternator should provide plenty of power. Check voltage at battery (from alternator) and should be around 14V. Check alternator fuse.
Could be the voltage regulator in the alternator going out, which would need a new alternator.

time for another battery. Have a load test done on battery. Then have someone fullfield the alternator to see if its operating correctly

sounds like battery is dead or the altinator is not charging at full capacity start the car take the positive lead off if it stalls altinator is gone if it runs its all good if it runs but rough altinator is not putting out enough power