Question about 1994 Ford F250 Supercab

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Randomly loses charge....after installing new alternator

While idling or running down the highway with blower fan on alternator suddenly stops charging ............ now doesnt charge at all ............ sometimes goes in spirts .......... any help please.......... have tried new alternator but didnt cure ................. 1995 F-250 Camper Special

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It would appear that your truck has a bad ground connection between either the battery to the engine or a bad connection /wire between the engine and the body frame (most likely). the wire probably broke a long time ago and just by luck and mechanics the connection was made but now the vehicle is older the problem is getting worse. My best solution is to run a new wire between the body frame and the engine -that usually solves most issues. Make sure the contact points are super clean, down to bare metal on both ends!

Posted on Nov 26, 2008


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Idle drops way low with fan,lights,ect..., on@ operating temp195, IAC is good power,no leak, power from computor;yes,under load, lights ect..,what am I overlooking? 91GeoMetro 3 banger

The electrical load on the alternator will pull the engine RPM down. It takes 10 H.P. to run the alternator. The only recourse to low RPM at idle would be to install a larger diameter pulley on the alternator. Extended idle could result in low battery charge rate. Should be fine at hi way speed. The alternator will not put out below 750 Rpm.

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Check that your alternator is actually charging the battery. With volt meter and car running check for at least 13.5 volts at battery. If not check fuses, big red wire from alternator to battery and for actual output of alternator at bolt where big red wire attaches to alternator. Should have battery voltage with car not running and at least 13.5 when engine is idling(motor running)

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My battery went dead and after i charged the battery the air conditioning does not cool

What happens is, you have a battery and an alternator. The alternator charges the battery when the engine is running. It can only put out so many amps at 12 volts. A/C compressor runs off the engine, but the clutch for it is electric, and the blower fan is electric. When these are running, unless the car engine is running at above idle RPM's, your alternator may not be actually putting out enough amps to run the A/C AND charge the battery. So it is possible for the battery to go dead, especially if you start the car more than a couple times with out letting the battery charge. It happened to a friend of mine. He delivered newspapers, and it was a hot summer day. His A/C was on, plus, his car had 2 electric fans for the radiator. He was only idling along delivering his papers, and at one point he shut his car off. When he went to re-start, it was dead. He called me and I gave him a jump start, and told him to go for a ride down the expressway, to charge his battery. You see the A/C took say 30 amps, then each cooling fan for his radiator took say 20 amps a piece, then add in the stereo, and the power it takes to fire the spark plugs, and there wasn't enough left to charge the battery. Most cars these days only have 100 amp alternators. Older cars have less

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1993 lincoln mark 8. The battery runs down and the engine gets hot when running the air conditioning.This happens at highway speed or city driving. I have added the a/c oil and 134a. I have no issues with...

Hello, You need to have the charging system checked with the A/C on. There are several things that are different with the A/C on. Most likely you have a marginal Alternator. Autozone, Advance and Oreillys give free tests.

When you turn on the A/C, the compressor can increase the drag on the belt that drives the Alternator. A weak Tensioner pulley or a stretched belt can slip around the Alternator pulley, reducing the charge capabilities. The Electric engine cooling fan is usually stepped up to high speed when the A/C is on, therefore using more juice.

Since your car is discharging at high speeds, the idle step-up feature may still be working when the A/C is on. The idle step-up is suppose to maintain a minimum idle speed to compensate for the A/C drag at idle. As long as you are not caught in slow traffic, your battery should recover by the high speed driving.

Your blower fan could be drawing a little more power too, but fuses should blow to prevent the blower fan from drainng your system.

I will recommend a Web site, for Salvage parts. You need to count the grooves on the pulleys as they are important and illustrated as 4G and 6G for a 4 and 6 groove part. It is possibly to buy a stronger Alternator for your car.

I hope my solution is very helpful.

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the squeal when you start is the drive belt, it is slipping on the alternate you have to remember that the starter is the largest load on the battery so when the engine starts the alternator goes into a full output mode so there is a lot of load on the alternator belt right after start up also this probably why you are having a low charge at idle the belt is slipping enough to allow the alternator to slip at low ingoing speeds, take a good look at the belt tensionor and the drive belt best guess is that you will need both a new belt and a new tensionor.......HAVE FUN

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Replace the alternator,it is not charging like it is supposed to.It should read at the battery with the engine running ,and head lights on,and ac on high blower motor setting,13.65 volts,to 14.25 volts,no less.also slow charge the battery to get a deep full charge,cause it will be low .

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Make sure wire conections to alternator are clean and secure. If it's still not charging properly at idle then alternator might need repair. Also make sure engine oil level is okay.

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