How freely should an alternator spin?
It should turn quite easily but more important is it should be smooth. Very smooth. New bearings will sometimes feel a bit stiff and not turn freely because of the new seals and new grease that is in them. However that is ok as long as they are smooth.
What should I do if my alternator is not working?
Even if you conclude the alternator is not working, the problem may originate elsewhere. You may have a blown fuse, a bad relay, wiring, or a defective voltage regulator, for example. Thanks! Some people recommend testing the alternator by starting the car, loosening the negative battery cable, and waiting to see whether or not the engine dies.
How can I tell if my alternator is in good shape?
Make sure the voltmeter reads at least 12.2 volts, then start your car and rev the engine to 2,000 RPM. Keep the engine running and check the voltmeter again. If the voltage is between 13 and 14.5 volts, your alternator is in good shape.
What should the voltage be on an alternator?
Check the reading on the voltmeter again. The voltage should increase by between 0.5 and 2 volts to around 13.6 to 15.8. If the reading stays the same or drops, that means the alternator isn’t charging and you may need a new one. If the reading is more than 2 volts higher, that could mean that your alternator is overcharging.
Do you need a multimeter to check your alternator?
A multimeter measures voltage as well as other electrical properties such as current and resistance. You want to measure voltage when you’re checking your alternator. Check the battery first. The battery is needed to start the vehicle, which, in turn spins the alternator at sufficient speed to keep the battery charged.
How do you remove an alternator from a Mercury 150?
One post reads as follows: “There is no idler pulley on the 150 4S drive belt. The belt is stretch to fit. To remove alternator remove the rear alternator screw, loosen the alternator front screw slightly and push alternator towards front of engine to unload belt for removal.
What should I do if my alternator is low?
Re-install by reversing this procedure. There is a regulator which appears to be internal to the alternator. Merc suggests the first thing you should check if voltage at battery appears low and connections to battery are known to be good is to connect a digital volt meter between the alternator’s output stud and a ground on the alternator.
What to do if your fourstroke alternator is blown?
As far as the fusable link, you need to disconnect it and check for continuity. If it is blown you need to find out why or it will happen again. Sounds like that back bolt is slotted. I couldn’t see a slot there but I’ll give it another look.