Question about 1990 Ford Aerostar

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Voltage meter went to red

I have a 1990 Ford Aerostar Van
I was driving and the voltage meter went to red
turned on my lights and they went dim
tried to start it again and it wouldn't start
the batter was dead.
Do I need a voltage alternator?

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  • cmiller581 Mar 22, 2009

    Did you ever fix it?

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  • Master
  • 4,669 Answers

You need an alternator, the regualtor is built in to it.

Posted on Apr 06, 2009

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If the headlights are dim when the engine stops, the alternator is not charging the battery.

A lead-acid battery will "recover" slightly when the engine is turned off. The recovery may be enough to allow the engine to be started again but if the battery is not being charged adeqautekly, the engne wills top running when the battery voltage falls too much. It won't last long, though. The battery terminal voltage should be around 14.5 Volts with the engine running. If it is 12V or less then the alternator is defective.

There are diodes in alternators to convert AC into DC for the battery. If you "jump start" cars with yours, its alternator diodes or the alternator's internal regulator circuit can be damaged due to excessive loads and/or what is called "inductive kickback" from the other car's starter.

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I have a 1990 ford areostar van the turn signals dont work,left,right,front,back. The emergency flashers work. When I turn them on before a turn they do shut off after the turn. Just NO lights come on


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To remove the lead from the battery to the alternator while it is running is to invite a destroyed alternator . Varying voltages with engine RPM is indicative of a bad battery or problem alternator regulator . Have a load test done on the battery to check for cell problems and have the alternator bench tested to check the performance .

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Its unusual for both doors to fail at the same time, but not impossible.
Since you say the lights dim and you can hear noise in the doors we will assume the motors have voltage and ground.
You would need to remove the motors from the regulators to see if the motors are faulty or if the problem is with the regulators or tracks.

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


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What is the condition of both front calipers? both rear wheel cylinders? and the complete brake lines and hoses of your van? If they are all good with no traces of leakage, then did you bleed the Mastercylinder on the bench first before installing in the van? Did you gravity bleed the 4 wheels first? did you bleed from the farthest wheel first? Are you using a new Master and not a re-built??

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The alternator may not be charging the battery. Jump start it, and use a volt meter at the battery, red lead to positive and black to neg. The meter should read between 13 and almost 15 volts, any lower than 13 volts, the alternator is no good. (this is done with vehicle running).

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Your alternator is going bad. It should only put out 13-14 volts and therefore is overcharging your battery. This causes your battery to get a dead cell. If you replace the alternator and battery, make sure you check the cables for any shorts.

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