Question about 1990 Lincoln Mark VII

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I have a 1990 mark 7 and something is dranining the battery. We check the battery cable neg disconnectec and the other end with a meter and it said that therw was 48 mv being drained, can you help, Nick

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Do you have air bags or self levalinng this could be your problem an air leak that cause your air pump to constinly run

Posted on Sep 05, 2010


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Convert battery cables from top post to side mount replacement ends?

If all you are doing is changing to a side post battery, just connect all the positive cables from the old pos post to the new pos holder and all the neg ones to the new neg holder. If you've already cut them all off and not sure where each wire goes, all the reds are positive, all the blacks are neg. To make sure use your continuity meter to test. Connect one meter lead to any good clean metal part on the car and test between each black wire in turn, the neg ones will show a circuit, the pos ones will not.

Feb 10, 2015 | 1993 Chrysler Concorde


Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw...

Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw still showing 12 volt drain with all under hood fuses, relays, and interior fuses and relays pulled.
3) Computer was the 12 Volt drain, & had to reprogram itself.
4) gave the new battery a good long charge, reinstalled the battery into the vehicle.
5) Hooked the battery up, pulled the keys out of the ignition, close and lock all doors with auto door lock. Waited minimum of 20 min so the computer would go back into the sleep mode.
6) after 20 minute wait, rechecked the voltage draw by removing the neg battery cable from the battery, hooking volt meter + lead to battery cable end, and neg lead to battery neg post, nothing showing or zero reading.
7) Hooked the neg cable up to battery, started the truck and let the engine idle to normal run temp, then fast idled 1200-1300 rpms for 2 minutes, then drove the vehicle for 5+ miles and alternating speeds. All appears back to normal now. Alt showing 14.2 to 14.4 volts, and no other problems.
After all of the afore mentioned, my problems began with a bad battery cell, thus caused my computer to have the memory reset.Until the computer was reset, I had a 12v continious draw down! I got this info from a repair manual, that I purchase sometime ago. Thanks for your alls help........EJB

on Dec 30, 2011 | 1996 GMC Yukon

1 Answer

1996 buick park avenue,battery goes dead after a couple of days ...i used a test light between the neg on the battery and the neg does light lights are staying on, and no cig lighters...

you need to hook up a dvom meter to the battery to check and see if your alternator is putting out 13.5 to 14.6 volts hook the meter to the alternator first get your reading then hook it up to the battery should have pretty much the same reading if not your battery cables have to much resistance corroded . or you can take the alternator off and have your local auto parts store test it for free same goes for your battery. Your battery could be bad even know you it says 12.6 volts they need to do a load test on it to see if it holds up under all your accessories then if your battery and alternator checks out fine and cables check out fine then I say you diffidently have a pacitic drain problem .

Oct 29, 2013 | 1996 Buick Century

1 Answer

Starter problems for 88 ford aerostar van 7 passenger. how do i know its the starter or bad connection?

Test your battery and starter by doing a voltage drop test. Put one test lead of your meter on the neg side of your battery, one on the positive. Check voltage. Make sure that you are actually connecting to the battery itself and not the terminal ends. Should read 12.8-13.2. Keeping the neg in the same location move the pos to the terminal end, engage starter, meter should read above 10 volts. Continue testing down the pos wire to the starter, checking voltage, until you find less than 10 volts. If the voltage is good at starter, have someone turn key to the start position, tap starter with a hammer. if starter engages , replace starter.

Aug 19, 2011 | 1988 Ford Aerostar

1 Answer

Gauge showing low output alt only 1yr old wondering if it could be regulator or batt or wiring

if you have access to a digital multimeter, connect the meter (set to volts) across positive and neg. terminal of the battery, should read roughly 12.6 volts, close to 10 volts, battery may be going out, also test the alt output, disconnect neg term and place negative lead to battery neg post and positive lead to neg battery cable (make sure meter is set to amps) should read near the rating, if both those, then you'd want to do a resistance test, (set meter to Ohms) disconnect battery and connect meter neg to either pos cable terminal or where the pos cable connects to the alt and connect positive lead to opposite of neg, should read next to 0, the check resistance of the ground by connecting meter between batt neg cable and body of alt.

- Spenser

Apr 04, 2011 | 1988 Ford F 250

1 Answer

Im not a mechanic and am familiar with my vehicle, the battery has been checked and is fine when hooked up it sparks but there is something severe that is draining the battery within an hour or two. It...

I do not think you have a short circuit because it would blow a fuse or burn the insulation off the wire and smoke a lot. Therefore, if the battery is being drained it could be a component pulling too much current when the vehicle is off. I have seen when the ignition is switched off the accessory power is in the on position, which will drain the battery. I find it strange that if you jiggle your cable the vehicle may start. This makes me think it could be a lose ground connection. You will have some components with constant power and if the positive or ground connection is loose or bad it will pull more current from your battery. So check connections to the block chassis and fuse bus first. If you obtain a multimeter (Volt-Ohm-Amp) and set it to amps to read current you can narrow the possible cause. Understand the meter may only read a maximum of 500 milliamps .5 amps or 10 amps so make sure the engine off so you do not max out your meter. Disconnect one end of your battery (Pos or Neg) and set your meter on amps and make sure you have your meter probes plugged in correctly to read amps. Connect one end of the meter probe to the battery cable and the other to the battery. You should see a reading on your meter. If you take a jumper cable and connect it to the vehicle chassis and the other end to the multimeter and the other multimeter probe to the negative terminal of the battery the current reading should be the same. If the reading is less then your ground connection on your vehicle is bad. Open the fuse box and randomly pull a relay and note the amperage reading on your meter. If you see the current drop note the relay and current reading on a piece of paper then replace the relay. If the current did not drop put a piece of masking tape on it to mark it as being tested. Now start pulling and replacing fuses again looking at the current reading for any changes noting the change on paper. Do the same for the fuse box and relays inside the vehicle. You can now see which components are pulling current when your vehicle is off which should help you find your problem.

Aug 17, 2010 | 1999 Chevrolet Blazer

3 Answers

Battery will dran over a short time and is the second new battery

The best way I have found to hunt down a current draw is with a multi meter set to the DCA setting (this will detect DC current flow). With the vehicle shut off, systematically remove fuses one at a time and place the leads from the meter in the connectors that held the fuse (one lead per fuse connection). You should have a little current flowing to the radio, for the clock, and maybe some to the engine computer and, if equipped, the alarm, the rest of the circuits should have no draw. This will narrow down your search to one circuit in the car, which can than be further diagnosed, usually it's a wire with the insulation rubbed through.
P.S. if the car has any after market equipment, such as audio amplifiers, start your search there. Hope this helps, good luck!!!!

Jan 20, 2010 | 1987 Toyota 4Runner

1 Answer

1990 chev 2500 with a 350

If your cable was indeed laying on a hot cylinder head, it will conduct heat from the engine and transfer it all through the cable, which will heat up the battery also. That cable should be replaced, and make sure the connection are clean, at both ends.

Jul 31, 2009 | 1995 Chevrolet Silverado 2500

1 Answer

1989 Ford F250 pickup- amp meter reads backwards

If you had a dead short when connecting the neg. battery cable, the battery was being installed backwards or you had grounded the alternator + lead somhow.

I suspect whnen you installed the battery, you have burnt all of the diodes out in the alternator and the AMP meter is showing no charge. The AMP meter also could have taken a beating in the reversal.

Check the battery in in correctly first. If not reinstall or get the correct battery. Then check the battery voltage with the engine running. If less then 13.2. Replace the alternator again.

Good Luck

Mar 16, 2009 | 1989 Ford F 250

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