What is a battery saver relay.

Asked by May 28, 2014 at 08:59 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: General

My altnater plug keeps giving 12.1
volts insted of 14 volts? We're is the
computer to those three cables?
1999 grand marqui.

3 Answers

23,035

Here's a diagram of your charging system. I'm not sure of what info you need. There is no Battery Saver Relay - at least not one that is serviceable - there are add-on's for police packages.

Thanks for diagram. I have new altenator , new battery . New altenator plug. New cable to fuse box from altenator. Still getting 12 v from altenator , I need 14 v to charge batt. Can't figure it out, mabey faulty ignition. Don't know. Need help. Thanks

You have a floating ground, which means you are loosing the 2.1 volts you are looking for. Do several to many voltage drop tests starting with your voltmeter black probe and sticking it into the battery negative post and your red meter probe to the post cable clamp. Write down all your values all the way back to the battery positive post. The bigger difference of voltage difference are where you have higher resistance, or a low resistance to ground. Do not clean, or tighten anything until you perform all voltage drop tests because you will see this concern again in the future, and by isolating and identifying the culprit, you can get to it much faster next time than to re-inventing the wheel. You can also help others, and they will thing you are a Guru, almost mystical. Maybe you can start a new religion! Just don't go around blowing things up, but helping spread the knowledge. Invest in a good set of wrenches, torque wrench, dielectric grease, and a wire brush. Lastly, get yourself a wiring diagram of your vehicle and start learning to read it like as if your life depended on it. Keep in mind that charge particles come out of one the the battery posts, go through the wires and circuits, and return to the other battery post. Voltage is consumed across resistive loads as power, and energy is stored in capacitive and inductive loads. Use Ohms law to calculate the resistive load consuming the 2.1 volts. There is no easy answer, but the answer is not the fun part, but the journey.

Your Answer

Add photo

Related Questions

  • radio 1 answer

    I put in stereo. Something arkd in the harness and now my dash lights girl guage. And instrument clusters do not work. Checked fuses of course. Relays no.

    2002 Mercury Grand Marquis

    -

    General

  • 2006 Grand Marquis turn signals 2 answers

    Front and rear turn signals blinking rapidly. ALL bulbs are working both sides front and rear. Including head lights, high and low, turn signals, turn lamps, markers, rear marker lights, tail light...

    2006 Mercury Grand Marquis LS Premium

    -

    General

  • Blowing fuses 7 answers

    Everytime we turn the key it blows a fuse

    2000 Mercury Grand Marquis

    -

    General

  • My windsheild washer pump didn't work so I replaced it with a new pump and it still doesn't work, what else could it be? 1 answer

    2008 Mercury Grand Marquis GS

    -

    General

  • What does the main relay do ? 2 answers

    when I put the key in the ignition, and go to start, all warning lights come on and then I hear a click and lose all power, just like a dead battery, then I disconnect the battery and reconnect all po...

    Mercury Grand Marquis

    -

    Maintenance & Repair

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 2,203 nationwide Grand Marquis listings starting at $1,995.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,150
#2 kbro
kbro
Reputation 2,040
#3 Js08016
Js08016
Reputation 1,620
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,219 listings starting at $1,700
Used Lincoln Town Car
30 Great Deals out of 2,076 listings starting at $1,995
Used Chevrolet Impala
795 Great Deals out of 34,381 listings starting at $799
Used Chevrolet Tahoe
775 Great Deals out of 28,448 listings starting at $1,500
Used Ford Taurus
255 Great Deals out of 20,464 listings starting at $1,500
Used Ford F-150
2,693 Great Deals out of 211,512 listings starting at $1,000
Used Honda Accord
812 Great Deals out of 81,598 listings starting at $899
Used Cadillac DeVille
6 Great Deals out of 1,954 listings starting at $1,750
Used Ford Mustang
362 Great Deals out of 44,353 listings starting at $1,000
Used Lincoln Continental
3,713 listings starting at $42,294

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
33 listings starting at $3,900
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 112 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 108 listings starting at $2,998
2008 Mercury Grand Marquis For Sale
8 Great Deals out of 175 listings starting at $2,995
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 161 listings starting at $2,400