Question about 1987 Ford Ranger

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Altenator not getting power - 1987 Ford Ranger

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J.D. Browning

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If you mean alternator is not charging battery
a device called a voltmeter is needed to diagnose this problem
Jump start vehicle , disconnect jumpers from other car , use a voltmeter on the battery terminals to measure (red lead on + or plus and black lead on - or gnd ) have a friend rev engine slighty if voltmeter rises it's reading to 13.8 and stays there no higher you just have a bad battery you'll need to replace it but if reading moves all about your regulator is bad that will need to be replaced (usually ruins battery as well) and lastly if reading stays low and does not move up but goes down your alternator is bad that will need to be replaced

Note : when dealing with batttery on car allways shield your eyes just in case there is a fault and battery explodes , acid in your eyes is no good

Posted on Nov 13, 2013

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Tip

Starting and Charging


All starting systems are basically the same in operation for manufacturers. The starter takes power from the battery to crank the engine. Generally the large wire on the starter is from the battery and the small wire is from the ignition switch. The large wire will have battery voltage on it all the time, the small wire will only have voltage when the ignition key is turned into the start position.

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