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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Posted on Jan 02, 2017

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1 Answer

1990 ford f150; The ignition switch turns both ways freely but nothing happens (no lights or anything) What do I do or how can you help me to fix this?


Make sure battery has a full charge and battery connections all good. Positive and ground connections. Use a test light at your fuse box. Fuses 1 4 8 12 16 show to be hot all the time. check for voltage using the test light. If nothing, have to track voltage from positive battery post. Ground is very important as well.
You could have problem with ignition switch? The ignition switch is spring loaded from crank position?
fuse box-kd5oizhvp01ilifqmpdh1oxf-2-0.jpg

Nov 02, 2017 | Ford Cars & Trucks

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Some time I can't start my 2006 d22. Battery is ok 12 volts and green colour in In checking window. After jump start no problems for weeks. How to fix the problem?


have a load test done on the battery
while it may show 12 volts , when the starter is engaged , that can drop to 6 volts indicating failed cells in the battery

Jul 13, 2017 | Cars & Trucks

1 Answer

1998nissan sendra doesn't charge but the battery light goes off when i start the engine when I remove bartery terminal engine stop running


A 98 still has a computer so with out power it will die my guess is corroded wires first use a multi meter and check for voltage on the terminal on the alternater it should show 13 to 14.5 volts D/C then check the battery see if it has 13 to 14 volts if yes it is charging if the altenater show 13 to 14 it is charging if the voltage is 11 to 12 or lower it is just reading the battery and you need a alternater if the aliternater is good and the battery is not charging it is either the power wire or ground you can use jumper cables to check jump from the post on the alternater to positive battery by its self if this fixes it it is the power wire if not unhook the positive and then connect the ground thermal to the engine block and see if that fixes it if not do both you will see the problem good luck

Nov 06, 2016 | Cars & Trucks

1 Answer

What could we h


Dirty battery terminals or posts , or faulty starter.

Nov 29, 2017 | 1992 GMC Sonoma

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

Battery running down.


Yes,the voltage regulator is bad,

Mar 26, 2017 | 1996 GMC Yukon

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

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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