Alternator ????

[Torqueranger]

I'm my 98 4.0l Sohc the battery is die very quickly if the lights are left on even after a couple mins ... But it will start with no problem even after a couple days of sitting .... I hooked up a meter while the motor is running the voltage is 13.03v DC so does this mean the battery is shot or is the alternator shot ????




Thanks
Jay Sr

 

[BrooklynBay]

It sounds like the alternator is working but the battery is either weak or it has corrosion on the contacts. Have an auto parts store test the battery.

 

[JimMadsen]

Where exactly did you test the voltage? How old is the battery?

Working alternators in my exp pump out 14v.

 

[Torqueranger]

Where exactly did you test the voltage? How old is the battery?

Working alternators in my exp pump out 14v.

I tested off the battery and I know the alternator is suppose to charge the battery at 14v to 15v according to one book.. So I am guessing the the apt was shot ... But plan on getting the battery tested too..

 

[JimMadsen]

Measuring the volts on the battery tells you nothing about its cranking amps. A battery test is in order. The alt can also be tested at a shop. But you may want to invest in a cig lighter port tester. Tells you how many volts are being run through the system while running. 14+, alt is probably in good shape.

http://www.amazon.com/INNOVA-3721-B...1403490613&sr=8-2&keywords=Car+battery+tester

 

[BrooklynBay]

A bad battery could put more of a drain on the alternator to keep the electrical system running, so that's why it's showing a 13 volt charge. A good battery with clean terminals will show 14 to 14.5 volts. Sometimes the charge will vary depending upon the load (stereo, headlights, wipers, defroster, etc) running simultaneously. Temperature & engine RPMs are also a factor.

 

[Torqueranger]

What battery do you guys recommend ?????

I can get a Autocraft Gold for $100 or so ??

Also what is the difference between the Autocraft Gold vs Autocraft Gold SD??

 

[lobo411]

What battery do you guys recommend ?????

I had a Sears Die Hard Gold that lasted 12 years, and the only reason I replaced it was that I figured nothing lasts forever.

I ended up buying a Kirkland/Costco battery because Sears has been closing stores and going out of business for 20 years now and I don't want to get stuck with a worthless warranty.