89 Mercury Sable; Won't Start, No Noise

Asked by Mar 27, 2019 at 01:36 PM

Question type: Maintenance & Repair

Have an 89 Mercury Sable that was running  fine.  
Now it won't start and there's no noise when you
turn the key. Battery was dead but I jumped it and
interior lights went on  and power windows work
but still no noise when I turn the key.

2 Answers

10,390

Use a digital multimeter across battery posts, everything off, the generic spec for a full charge is 12.6 volts, if much below that, use a charger and get it charged up. Make sure battery connections are all good. After that that, with meter leads touching the battery posts have a helper turn key to crank position, how far does the reading drop or does it drop at all. The reading shouldn't drop below 9.6 volts, if it drops way down, that isn't going to work and may be a problem with battery. Just my opinion.

87,425

Many people are confused about battery power; they ask, if my lights are on, why won't the car start? Well, it takes less than twelve volts to get the lights & accessories on, but the starter motor takes much more to get it turning. No noise from the fuel pump should be a sign that there's insufficient juice in the battery and a quick jump won't correct this. Take the battery to a car parts store and have it checked; they can sell you a new battery and your car should run like before.

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