Question about 1991 Lincoln Town Car

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Charging system on a 1989 Lincoln Mark 7

I have a new battery, replaced the voltage regulator and alternator. Still have a charging problem I KNOW it has to be in the connections somewhere. replaced the battery terminals with brass ones. Do you think I should start replacing the negative and positive wires that lead to my battery? The air ride system is out so the ride is rough right now, I'm thinking something has come loose. Any suggestions on how to diagnose the problem without replacing everything?. I do have a voltmeter not honestly sure how to use it correctly.

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Yes,change cables .voltmeter works by finding hot or power lead & checking it to ground .never use wire as ground go to for finding it start at the top & work to bottom.

Posted on Jan 06, 2009


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1 Answer

Check charging system

Check and see if you have an external voltage regulator. A lot of ford products have an externally mounted regulator. If so, replace and repaired! Good luck

Nov 09, 2013 | Lincoln Cars & Trucks

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1989 f350 7.3 replaced voltage regulator and alternator same time. still not charging

you should have 12.5 volts with engine off at battery and 14.4v with engine running and charging system working. Is alternator light on? please rate, thx.

There are different versions and 1989 is too old to get on line. here is 1993, so take with caution. Also check the fusible link.

Battery Positive Voltage (B+) Output
The generator (alternator) output is supplied through the Battery Positive Voltage (B+) output connection to the battery and electrical system. I Circuit
The I circuit, or ignition circuit is used to turn on the voltage regulator. This circuit is powered up with the ignition key in the RUN position. This circuit is also used to turn the indicator on if there is a fault in the charging system operation or associated wiring circuits A Circuit
The A circuit, or battery sense circuit, is used to sense the battery voltage. This voltage is used by the regulator to determine the output. This circuit is also used to supply power to the generator (alternator) field coil. This circuit is connected back to the load distribution point and is a protected circuit. S Circuit
The S circuit, or stator circuit, is used to feedback a voltage signal from the generator (alternator) to the regulator. This voltage, typically 1/2 battery voltage, is used by the regulator to turn off the indicator.


Oct 12, 2011 | 1989 Ford F 350

1 Answer

I seem to have a charging of the battery problem. I would get 14 volts to my battery from my alternator and then 6 volts, i changed m alternator and things were going great, no problems. Now it is acting...

If you were originally having a wild fluctuation in measurement at the battery the voltage regulator would have been shot. I'm not sure of what the condition was of the original alternator. But I would definitely have changed the voltage regulator. A bad regulator can ruin a battery and all sorts of other things. If you are now getting wild variations in voltage
1st Purchase and install a new voltage regulator. (probably about $20.00 these days.
Then check your new battery by doing the following:
1 Disconnect it from the truck's electrical system.
2 Charge it up using another vehicle and jumpers.
3 After disconnecting the battery from the jumpers, let it sit for a few minutes.
4 Check the voltage. If it is below 12 volts, the battery is shot. Replace it under warranty.
5 When you get the new battery, Install it in the truck and start it up. Then measure the voltages coming into the battery from the alternator and the new voltage regulator.
If all is well, your done.
If not. Pull the alternator and replace that.
Hope this helps,
Good Luck,

Jan 05, 2011 | 1988 Dodge Ram 50

1 Answer

Loss of battery charge, with new battery. Amp meter reading charging when motor is running.

Hi, There is a slim possibility that the new (or rebuilt) battery is defective.
Here are the things that cause it. And the things that don't.

The voltage regulator controls how much electricity is used to charge the battery and how much is going into the electrical system of the car. The electrical system may has been designed to integrate the voltage regulator into the case of the alternator. If that is the issue, the alternator can be replaced, or if there is a skilled person that does rebuilds in your area, he will know how to change the diodes in the voltage regulating section of the alternator. You can save money this way. If you have a volt meter or a multimeter, (commonly around $25.00 these days and between $4 and $7 at Harbor Freight), you should get a reading of around 12 volts from the battery when it is charged and the engine is off. If the battery is down, the voltage should still be in that area, but not enough of a kick behind it to do anything but light a small bulb. When the car is started and the voltage regulator is doing it's job you should get at least 13.5 volts DC at the battery terminals.

Many of the symptoms that occur also happen because of poor electrical contact at the battery.
Use Baking soda and water to clean the terminals of the battery of corrosion. And then use a battery cleaning tool for the battery posts and the battery wire clamps that go around the post. Make sure all of the connectors and wiring is sound.

I would then test all of this doing the following steps..

Charge up the battery.

Then connect the system and do the voltage checks. If the Battery is charging properly, the regulator will gradually reduce the charging voltage it is using to charge.

After 15 minutes, shut the engine down and check the battery voltage. and turn on the headlights to see if they are still bright.

If the voltage is at 12 volts DC the battery is OK.

One very simple test of a charging system is to charge the battery, start the engine, then pull the positive terminal off of the battery. If the engine dies, then the voltage being generated from the alternator is too weak.

If your battery is bad it will show low voltage. If one of the plates in it is shorted out. The voltage will be 10 Volts.

Hope all of this helps,
Happy New Year,

Jan 04, 2011 | 1996 GMC Yukon

3 Answers

Where is the voltage regulator located on a 2002 lincoln continental, car battery not holding a charge

Voltage regulators are electronic, internal on most units, now days, and not adjustable. Look for failed diodes. Easiest to pull the alternator and bench test it..

Oct 15, 2010 | 2002 Lincoln Continental

3 Answers

Where is the voltge regulator on a 1989 lincoln town car


May 16, 2010 | 1989 Lincoln Town Car

1 Answer

How do i polarize alternator after new regulator saab9000 1989?

You dont. Alternators DO NOT require polarisation as they can only be fitted to vehicles that are wired as NEGATIVE EARTH. If you have replaced the Alt, reconnect the wiring, reconnect the battery - Positive lead first then the negative lead, then start the motor !! Using multimeter, check the charge rate at the battery. It should be around 13.8 volts. The charge rate SHOULD NOT go above 14.7 volts and if it does, turn the motor off immediately and recheck the connections, especially any battery voltage sensing wires. if nothing appears to be wrong, contact an auto electrician and have them check things out. I have known faulty regulators, even in new Alternators..

Dec 27, 2009 | 1989 Saab 9000

2 Answers

Will not charge. replaced alternator, and voltage regulator. fusible link is good. battery tests good

good the alternator you installed be bad? if it tests good then theres a fuse or a wire thats bad, check links at starter and battery and alternator if it has them there,start there, i would first have that alternator tested.good luck. also check wiring to regulator had problems with that!!!!

Nov 14, 2009 | Lincoln Mark VII Cars & Trucks

2 Answers

Short, draining the battery

The biggest problem ALL Mark VIIs have as far as electrical gremlins is the Voltage Regulator. Swap out the V/R and have the alternator and battery checked for free at your local AutoZone.

Jan 06, 2009 | 1989 Lincoln Mark VII

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