How can you tell what amp alternator you have?

How can you tell what amp alternator you have?

Look for a diagram under or near your fuse box cover. It will have individual amperage numbers (sometimes along with volts) already set by the manufacturer. Add up those numbers to find what amperage your alternator needs to feed the car’s electrical system. Verify this number with the part manufacturer, if necessary.

Which is alternator do I have in my Silverado Sierra GMC Truck?

Thanks but my problem is that the truck doesn’t have its original engine. The first motor was also a 4.3 and hopefully the same alternator, but to be sure is there anyway I can tell on the alternator what its amperage is? Re: Which alternator do I have?

When does a GM alternator need to be replaced?

A GM alternator that is producing too much voltage must be replaced. When a car does not start or the lights are dim, it may be because the voltage output has dropped lower than 13.5 volts. When this happens, the battery is not being charged, and the electrical systems of the vehicle will fail.

What do you need to measure the output of a GM alternator?

It is pretty simple to measure the output of a GM alternator. All you need is a voltmeter, also known as a multimeter. One of these can be purchased at a parts store or even an electronics store.

When to replace ground straps for high amp alternator?

When you install a high amp alternator, or when you have someone else install it, you should consider replacing both the ground straps and the power cable that runs from the alternator to the battery with heavier gauge cables.

Thanks but my problem is that the truck doesn’t have its original engine. The first motor was also a 4.3 and hopefully the same alternator, but to be sure is there anyway I can tell on the alternator what its amperage is? Re: Which alternator do I have?

How to identify your GM alternator USA built high output?

This is just a quick visual identification guide for Delco type alternators. First Alternator used on GM Vehicles to replace old DC Generators. External regulator mounted on the firewall.

A GM alternator that is producing too much voltage must be replaced. When a car does not start or the lights are dim, it may be because the voltage output has dropped lower than 13.5 volts. When this happens, the battery is not being charged, and the electrical systems of the vehicle will fail.

When did the GM 21si alternator come out?

First internally regulated alternator used by GM. Replaced the externally regulated 10DN. Again, first used on the Corvette. Wasn’t into full production until about 1962. The 21Si and 22Si are near identical cosmetically. Internal differences are…