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Need diagram for harbor freight 8750 . the 12 volt cicrcuit is what i am having issuses with. the start switch or parts ln that cicuit are not working as the unit will not turn over

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Harbor Freight doesn't publish this type of diagram.

Posted on Dec 05, 2016


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Get a $5.00 tester in Harbor freight and tools
Scale in DC lower scale but grader than 12 volts
tester have a positive red and negative black cable
black to chassis and red on the thick cable of the alternator
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1993 mercury capri charges then doesn't new alternator and battery

It's best to relate symptoms to narrow things down. I assume you are still getting a dead battery when trying to start even after replacing the alternator and battery.
Get a volt meter. Harbor freight sells them ridiculously cheap (about $5). Measure the voltage at the battery terminals when the engine is running. If it is at least 13.5 volts to 15 volts then the alternator is charging correctly. If it is 12 volts then the alternator is not charging the battery.

If the alternator checks out ok, then check for things that could be draining the battery when the car is off. Usual suspect is the trunk light. Put your cell phone on video record into the trunk facing the light, then shut the trunk. If the light stays on, its because the switch in the latch mechanism is faulty. WD40 might make it work, or just pull the bulb. Also, check the glove box light the same way. Good luck...Chris

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How can I find out if the alternator is not charging the battery?

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i would try a radiator, when it does start, take the positive battery cable off the battery, if the car dies, its your alternator\

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If you don't yet own one, invest under $20 US in a cheap digital multimeter, they will pay you back quickly and if you want to look into your own electrical problems, you'll need it. Also handy to have one for doing simple electrical work around home.
If you are in the US and have a Harbor Freight nearby, you can buy one for <$10. They are available from any electronic/electrical supply or auto parts stores.
With the engine running, you should measure >13 volts on either even at an idle and the nominal fully charged value is 12.6 volts with the engine off. 

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