Car sometimes won't start, but battery is fine?

Including Hyundai, Audi, BMW, Mistubishi or any other car.
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carriedi
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Re: Car sometimes won't start, but battery is fine?

Unread post by carriedi » Mon Mar 17, 2014 11:50 pm

a scanner won't be much help if you lose your power.

Yes, I would take a good look at your battery connection. Even if the terminals look good you may have a poor connection between the terminals and the cable clamps. Don't use a scanner use a DVOM, voltage meter or a test light. Next time you don't have any power inside the car use the meter or test light and check between the center of the battery terminal and where the cable connects to the vehicle. You're looking for almost no voltage reading means you have a good connection or battery voltage meaning that you don't have a connection through the clamp. If you aren't familiar with checking voltage drop it may sound strange that reading battery voltage is a bad sign but you are not trying to find battery voltage, you are looking for the voltage drop in your cables. both ends of your cable should have the same voltage. if you have battery voltage between the battery post at one end of the cable and the other end of the cable that means the circuit is open.

If the cable connections check out to be ok you should verify that you have good ground connections to the body and the motor. If that checks out follow your power to the under hood fuse box
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carriedi
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Re: Car sometimes won't start, but battery is fine?

Unread post by carriedi » Wed May 28, 2014 10:14 am

this was an answer to a post about a loss of battery power that is no longer available
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babulenka
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alternator

Unread post by babulenka » Mon Aug 18, 2014 2:01 pm

battery charging reading is 16 volts is it overcharging and what can i do about it

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carriedi
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Re: alternator

Unread post by carriedi » Mon Aug 18, 2014 2:55 pm

yes it is overcharging. have your charging system checked. make sure your gauge is not off. charging voltage for American cars and trucks should be from 13.8 to 14.2 with a good battery.

poor connections to power or ground could cause a charging problem. a voltage regulator could be a problem. depending on the vehicle the regulator could be in the alternator, outside the alternator or in the power control module.
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