Question about 1998 Mercury Sable

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I unhooked the battery and hooked it back up and the car will not fire now

I unhooked it to put in new alternator.and i hooked it back up no start.batterys good alternators good gas is good.its like its not getting spark.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 958 Answers

SOURCE: Battery, battery, battery!

you do have a short in the electrical system, test this by putting a freshly charged battery and connect the negative to the battery then try to just scratch the positive wire to the battery and watch if there is a big spark that would be produced. if there is then you have a short that is draining your battery. if there is a small one . that could just be your clock or radio. if you have an ammeter ( a tool to measure current) you can take the current that the car is drawing as you put the positive wire to the battery.

another test is start the car. get a volt meter that would measure dc voltage in the range of 20 volts. then measure your battery voltage. it should read at least 13.8 volts dc. turn on your head light, it should still read at least 13 volts dc. then lastly, tun on your ac if you ahve one. it should still read above 12 v. at least 12.5 v. that means your alternator is charging.

all of the test and readng are on idling state.

then rev the car to 2000 rpm if you have an rpm meter and all of the voltage should increase a little bit but not exceed 15 volts.

if it does exceed 15 volts then you have a bad regulator that fries batteries.

i hope i was able to correct your problem.

Posted on Jul 08, 2008

michigan man
  • 3533 Answers

SOURCE: put new alternator on getting fire to charge light

you may need to go back and get another alternator cause this one sounds as if it has a bad voltage regulator in it also give these websites a try www.autozone.com and www.alldatadiy.com also checkout your drivebelt if the car has over 40,000 miles on it you may want to change it also wish you the best of luck Michigan Man.

Posted on Nov 27, 2009

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Where both rebuilt alternators any good
& retested at store?

Your explaining a constant voltage drop,
once the battery is hooked up.

How about the ignition switch?
Does that have anything to do with
the regulator control in alternator?

You haven't said you have 14 plus volts
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All I said is what you already know

I'm is missing something?

Don't unhook any battery cables with
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