Question about 1990 Chevrolet K1500

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I have a charging problem, when a use the acessories it pull alot of juice from the system and really drags down the alternator. is it grounded correctly? the vehicle wears out alternators and batteries quick. when i chang the fan speed on the a/c you can watch the amps drop away with each higher speed.

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Was the alternator replaced with a lower amperers rating? Did you check the battery draw? Check all the ground locations in the engine compartment. usually on each side of the block to the frame. One ground wire at the rear.(mesh type ground wires.

Posted on Jul 26, 2009


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Car battery corroded, terminals white. Jumped car but doesnt rev. Must it be alternator or could a dud battery suck the juice from alternator to stop car reving?

I would take the battery out and have it checked, or, you might want to invest in a modern battery charger that can also check the charging system as well as desulphate lead acid cells.

Jan 26, 2015 | Cars & Trucks

1 Answer

Why is battery light on. new alternator and battery 95 geo prizm

the Aternator "SYSTEM" can fail for these reasons.
skipping bad alterntor.....
1: bad wiring.
2: bad charge lamp (no, not yours)
3: bad connectors , really same as #1
4: alternator not grounded.
5: battery cables bad. (the 4 corroded ends) or the ground wire
to the top starter bolt, not there, or loose.
6: the fuse blew in the front right fender fuse box. (huge fuse,pulls out)
its not this fuse....
7: belt loose.
8: engine RPM way below 800, 750rpm is spec, mininum.

the alternator regulators on all cars , can in fact shut itself down.
this confuses many car fixers.
It will shut down, if.
over voltatge
if over current.
or sees the battery as being, bad, (high internal resistance or OMG not connected.
its really, mostly a 1995 toyota corolla.

the regulator is inside the alternator;
there are 3 fuses, that can kill it.
IGN, not this one, because that kills spark too.,
GAUGE, not this as that kills the charge lamp.
ALT-S fuse, BINGO?>

the 100amp fuse is not blown or many things on this car die.
to find this cause, takes one tool, a voltmeter.
doing simple tests.

Jul 19, 2014 | 1995 Geo Prizm

2 Answers

Charging system failure grand prix

Maybe also do the same to all the ground connections to the motor and alternator then clean the connector terminals to the alternator

Jul 27, 2017 | Cars & Trucks

1 Answer

Hi I have a 2005 peterbilt 379. I have replaced battarys and alternator and it show it charging good as soon as I turn on my head lightsthe volts go down 12 on my gauge when I hit a bump its back to 14...

Depending on the output of your alternator, and the rpm range of your idle. will determine how much and how fast the alternator works to charge your batteries.

as well as having inverters attached to your batteries that draw juice from these batteries as well as your lights.

look into adding or changing your trailer or marking lights to LED it will help on the draw from your electrical system.

Aug 31, 2011 | 2000 Chevrolet 3500

1 Answer

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.

Jul 10, 2011 | 1993 Lincoln Mark VIII

1 Answer

Will not start . thought battery was weak because it seemed like starter was dragging 2 days before not starting. now when i turn key all i hear is relay clicking inside fuse box

Battery and charging system needs to be tested. If the alternator quit you can only run so long on the battery untill it runs out of juice. Boost the truck and let it run for a couple minutes ( remove booster cables ) then remove the negative cable from battery.. if it keeps running the charging system is fine and the battery is to blame.

Jul 29, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My 93 jeep grand cherokee starts but it draws a lot of juice then it dies. So far I have replaced the fuel pump, starter, coil, ignition, and alternator. Any suggestions?

Based on what you noted, your system is not drawing too much, it is overcharging. Determine if you have an external regulator in your system (depends on alt. make and alternator design) Many of the Jeep systems have the voltage regulator as an integral part of the main computer. Likely it has failed. Also make sure that the charging system is properly grounded and the battery is fully charged and can undergo a load test without substantial voltage drop. If it cannot, it will over-work the alternator.

Oct 25, 2009 | 1993 Jeep Grand Cherokee

1 Answer

Charging system wont charge. i put a new alternator on and its still not working. thinking a bad wire some where or something but not sure

Check/test all charging system components. Have battery tested; check cables for good connection and corrosion; check belt for looseness or cracks; even if you just bought a new alternator, it could still be bad. There are alot of shops and parts stores that will check your charging system for free.
If it's discharging when vehicle is just sitting, probably a bad ground or loose wire somewhere.

Oct 25, 2009 | Hyundai Motor 1998 Sonata

2 Answers

1977 Ford F250 400m electrical problems

It doesn't sound like a ground, but there does exist an engine to body ground strap the gets forgotten quite often. It is located at the rear of the engiine going from an intake manifold bolt tothe firewall. Check the charging voltage of the alternator at the battery posts. The charging rate should be between 13.6 to 14.2v. Remember this, The higher the voltage the lower the amps In turn the lower the voltage the higher the amps. If the alternator is charging at 14v, it should drop towards 13,even as low as 12v, depending on the battery and accessory loads.At 12v, the alt is pouring out some serious amps and running hard. This is not good for the alternator. That's the reason for 13.6 being nominal. If the alt puts out 15v, this is also harmful. Although you aren't getting the amps, the high voltage will burn up things designed to run on 12v, Like lights and radios, relays and such. I hope all this makes sense to you and is of help. Check the eng to firewall grd, Ck your charging voltage and give your battery ground a second once over at both of the cable ends, loosening the bolt on the engine end and making sure its clean. Checking the + connection wouldn't hurt. Good Luck, Ned. Let me know, k?

Oct 06, 2009 | 1982 Ford F 250

1 Answer

1998 F-150 xlt triton v-8 doesnt charge battary had alternator tested at auto zone tested ok what else could the problen be

If the alternator and the battery are good, the next most likely thing is a bad connection someplace. Remove the battery terminals and clean them up well. Also, try to find your main ground wire, usually bolted to the chassis or engine block, and make sure it's clean. If just one connection is really dirty, the alternator can't get the juice to the battery.

Aug 30, 2009 | 1998 Ford Explorer

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