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How to test alternator output?

HI, just bought a performance alternator that supposed to put out 130amps a 2000rpm. Can this be reliably tested or I will just have to believe the manufacturers claim and hope its true.


It can be tested, but I doubt you have the equipment to do it. It will need to be load tested on a bench to see if it can make that 130 amp rating. Take it to automobile electric shop, they will have the test equipment.

How to Test Alternator Voltage Output (AutoUpkeep.com)

After watching this video, you will be able to safety test alternator voltage output. This test can be completed using a basic multimeter (~$25 ...

How to Rebuild an Alternator : How to Test a Car Battery

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Running Around

An Indian and a Gypsy

This is the travels of Joe and Nancy. We started full timing May,1,2000. Come be with us as we travel and see this great country of ours. We travel in our motorhome visiting beaches,state parks,national parks,corp of engineer parks. We have overnighted in Walmarts,24 hour grocery store,boat ramps,FlyingJ. We are on the road for the summer and early fall visiting family and just going whichever way the wind blows us.

After checking everything I could think of I thought that the trouble with the engine was the alternator.  I took the alternator off which wasn't very much trouble since it sits right on top of the engine.  So yesterday Nancy,Jackie and myself went down to Morehead to run around.  I took the to Advance Auto to have it checked. I watched the guy as he hooked it up to the tester. The only problem with his checking he said that the wire lead he had was missing a wire(not good). Anyway he said it was only putting out 12 volts.  So next stop was Auto Zone to see how it checks out on their tester.  Again I watched as he hooked it up with all the wires to all the connections on the alternator. The tester showed it failed all four test.  This is a 130 amp alternator,they had one in stock so I said I'll take it.  The prices was around $100.00 less then I thought it would be,still cost quite a bit but still not like I thought. I will put it on in the next couple of days and I hope that was really the problem.

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So if the alternator, voltage regulator or wiring that connects the charging system to ... a battery cable while the engine is running to "test" the alternator. ...

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How to test you alternator - simple test, article with video. This page will give you a simple way of telling if your alternator is faulty and needs changing.