Question about 1991 Ford F150

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Battery in my truck shows +12 and post shows -12.

How can I fix this problem?

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Are you hooking the meter up backwards ?
have you recently charged the battery from a " dead " state ? if so you may have charged the battery to its reverse polarity.To correct this,completely drain the battery by hooking a headlamp or something like that to the battery,wait until the battery is completely drained and recharge with putting the RED clamp on POSS. and the BLACK clamp on NEG.

Posted on Dec 26, 2008

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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

3 Answers

Ford tuarus has no power. Nothing turns on including ignition. Could it be bad or corroded battery cable?


Yes it can be; or it could be that the battery is dead (or bad).
Disconnect the cables, clean the battery terminals, clean the inside of the cable ends. Connect a battery charger, let it charge for at least an hour (don't just use jumper cables from another car). Once charged try it. If you still get nothing, it could be that the battery is shot. In that case, replace it.

Jul 31, 2014 | Cars & Trucks

1 Answer

No power to starter starter is good


Confirm power is availible at starter main power supply, step one , using mutl meter check for 12 volts at battery positive terminal , 2, check main voltage supply lead to starter from battery pos post , 12 volts present? yer check voltage supply lead from battery pos post to altenater , then to starter , 12 volts present, yes , check small wire to starter at starter for switched 12 volts present yes change stater after confirming suitable ground, no, trouble shoot ignition / starter switch in colume

Mar 08, 2013 | 1999 Land Rover Range Rover

1 Answer

How can i know if my voltage regulator is working, Im not getting any of my lights to work


quick check is to remove a battery cable while the motor's running. If the motor stays running when you pull off the battery cable, the charging system is functioning properly, if it dies then there is a problem with the charging system. Don't leave it off long, as this test is stressful to the circuit. You can test the voltage regulator by putting a volt meter across the battery posts to verify voltage. A fully charged 12 Volt battery should show slightly above 12 volts DC. With the engine running and the volt meter hooked to the battery, the charging system should be showing around 13.8 volts DC.

Dec 02, 2012 | Cars & Trucks

1 Answer

My alternator won'charge and it and the battery


batteries will show 12 v and still not have enough amps to start the vehicle, clean all the connection points on the battery , and charge it fully, start the vehicle and check again for voltage at the battery posts, you should have a reading of 13.5 to 14.5 volts, if not, yes you have a alternator malfunction,

Jul 23, 2011 | 1992 Lexus Ls 400

1 Answer

I need a new battery for my 1986 Oldsmobile ninety-eight regancy sedan. fully loaded. what type of battery would i need?


Attributes Battery BCI # : 75
Battery CA @ 32 Degrees F : 775
Battery CCA @ 0 Degrees F : 630
Battery Height : 7 1/4"
Battery Length : 9 3/4"
Battery Posts Type : Side Post
Battery Reserve Capacity : 90
Battery Voltage : 12 volt
Battery Weight : 33 lbs.
Battery Width : 7"
Wet or Dry : Wet
A lead acid battery with the fallowing specs
group 75



Attributes Battery BCI # : 75
Battery CA @ 32 Degrees F : 775
Battery CCA @ 0 Degrees F : 630
Battery Height : 7 1/4"
Battery Length : 9 3/4"
Battery Posts Type : Side Post
Battery Reserve Capacity : 90
Battery Voltage : 12 volt
Battery Weight : 33 lbs.
Battery Width : 7"
Wet or Dry : Wet
Attributes Battery BCI # : 75
Battery CA @ 32 Degrees F : 775
Battery CCA @ 0 Degrees F : 630
Battery Height : 7 1/4"
Battery Length : 9 3/4"
Battery Posts Type : Side Post
Battery Reserve Capacity : 90
Battery Voltage : 12 volt
Battery Weight : 33 lbs.
Battery Width : 7"
Wet or Dry : Wet
Battery BCI # : 75
Battery CA @ 32 Degrees F : 775
Battery CCA @ 0 Degrees F : 630
Battery Height : 7 1/4"
Battery Length : 9 3/4"
Battery Posts Type : Side Post
Battery Reserve Capacity : 90
Battery Voltage : 12 volt
Battery Weight : 33 lbs.
Battery Width : 7"
Wet or Dry : Wet

Feb 27, 2011 | 1986 Oldsmobile Regency

1 Answer

I have an electrical problem. When unhook my negative clamp form battery i can get 12 volts from my negative post to a body ground. So I have a short somewhere. Where would it be.


IF YOU UNHOOK THE NEGATIVE CLAMP FROM THE BATTERY AND YOU STILL GET A READING FROM NEGATIVE POST ON THE BATTERY TO THE FRAME YOUR METER IS COMPLETING THE 12 VOLT CIRCUIT AND THAT IS WHY YOUR READING 12 VOLTS ON YOUR METER. SOME BATTERY CABLES HAVE A SECOND GROUND FROM THE CABLE TO THE FRAME BUT IS CONNECTED AT THE BATTERY POST SUCH AS A FUSEABLE LINK WHEN YOU DISCONNECT THE CABLE YOU DISCONNECT THE GROUND. IF YOU HAD A SHORT AND READ 12 VOLTS THRU THE GROUND YOU WOULD DEFINETLY SEE SMOKE

Sep 26, 2009 | 2005 Mercury Mountaineer

4 Answers

Acts like bad battery but new


You have a bad ground connection no doubt. remove and clean the battery post real good and reinstall.

Sep 18, 2009 | 1997 Jeep Wrangler

2 Answers

1994 dodge truck codes 12 and 55


12-- Battery or computer recently disconnected. Check the connections or, wiring harness that is connected to the CPU. Make sure it is in good condition. Check the battery post cables for faults as well.

55 is end of codes - it's normal. Before you call your dealer or mechanic, consider that the blink-spacing is not always perfectly uniform, so if you see 23 23, it's probably just a single 55. (Codes are not repeated.)

Jun 24, 2009 | 1994 Dodge Ram

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