Question about 2005 GMC Envoy

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Volt gage!! new alt., idle body cleaned, good battery. when heat gets turned on volt goes down

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That sounds about right . the voltmeter just tells you how many volts the battery is holding,if you turn your lights on high beam turn your wipers on and your heater all at the same time,as soon as the current being used is greater than the alternator can charge , you will see the needle on the voltmeter drop back that is normal and logical. if you are running spotlights etc you may need a higher wattage alternator a lot of vehicles come out with 55watt alts.and the owners change the alts. to 100 watt alts... NOW as long as yours is not dropping below 12volts it is not draining your battery so there will be no ill effects it just means the alternator is working close to its capacity-------------------- there you go ,I would not be worrying too much unless it flatens your battery Idony think you need worry "youdoit"

Posted on Sep 25, 2009

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I have a 1992 lincoln town car and replaced alt and battery. on idle its at 14.4 and then soon as i accelerate to about 1500rpms lights dim and voltage drops to 12.2 and battery light comes on let off gas...


I would go back to the power and ground cables. First, you checked grounds and cleaned them. Do you have all the grounds in place. From the battery, you should have a ground from the battery to body, battery to the engine and from the engine to the body. Positive side should be from the battery to the alternator, battery to the starter and battery to the under hood fuse panel. Check these cables also. Since you 14 volts going to 12 volts, I would suspect a engine to body ground or corrosion at the fuse panel plugs/connectors.

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1999 Toyota Avalon battery discharge light and abs light intermittent. Changed battery and alternator no change to issue. Checked voltages with multimeter 12.73 with car off and 17.03 with car on. Ple


17v on is bad. its too high.
are you using a good voltmeter. a DMM, ? or relic analog meter.?
you put a new alternator in the car? not from autozoned i hope.
the wiring to the Alternator must be all good, them includes the case ground and battery cables, end to end, good and tight and not corroded.
the regulator is inside your ALT>
the ALT has 5 connections 1 is ground. any bad, reg can go nuts.
newer cars , go less nuts. they detect more errors and shut down
your is overcharging and will burn a battery up in no time.(heat)
wire:
Grounds good.
idiot lamp ,must be there, an working or alt may start up dead.
the lamp creates excitation currents, to boot up ALT.
wire B, goes to battery via fuse link, if this big wire fails. all bets off.
wire IG goes to 7.5A gage fuse, it must not be blown.
wire S, (sense) is 5amp ALT-s fuse, this senses battery voltage
if this wire drops in voltage the ALT will go to max. (or shut down)
toss coin there, lots of regs sub'd out in so many years, and rebuilts.

the regulator is not working right.
that means 3 things.
1: reg is bad.
2: reg is being lied to. (bad wires) even bad battery.

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1 Answer

Lead wire from left battery that goes to alternator makes the battery start smoking like its going to blow up. if I un plug alternator batteries will not charge. lite on dash says check gages.


Start the vech and take of the pos ternimal from battery and if it stays running means the alt is good but if it shuts down the alt may be U/S.Make sure everything is turned off.

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Have a 2003 ford focus. idling problem


if you have 14 volts or more at the battery at 1000 rpms, the battery & alternator are fine. If you get the same surge when you turn the bower motor on high speed, it is just the normal load on the alternator as it puts out more current. The engine is supposed to compensate by kicking up the idle. It does this through the IAC, idle air control. You may need to clean the IAC passages and the throttle body passages. I also would clean the MAF sensor heated wires with carb cleaner or MAF sensor cleaner. The MAF is in the iar intake hose and has a 2 or 3 wire connector going to it. The heated wires are in the air stream. Then disconnect the battery for 2 hours to clear the "Keep alive memory"
It will relearn after you drive for 10 miles. May run rough for that time.
good luck.

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1 Answer

91 ford temp w/new alt. ran good for a few days but now it died again and the amp light is on. Can jump it off and it will run for a while. Has new alt and new battery. Also , when you get on the brakes...


HI there
Try checking a few things first like jump start again and then take off the earth lead only{black} and let it run for 6 minute on idle then turn on the head lights main beam ,,if the engine dies in about 2 minutes then the Alternator isent working full power as it should be pumping out 13.5 volts min and the lights should be bright and stay on... if not you have a Alt problem still like a bad feed to alternator or a bad connection on the battery post or a loose wire from engine to body {earth wire } also check out the relay to Alt ..
Let me know how you get on . RON

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2 Answers

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Now change the sulfated batery for a new one.
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RPM GOES UP AND DOWN.


probably vacum leak around throttle body or carbon in idle motor try cleaning throttle body and idle motor with carb cleaner good luck

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When I turn the ignition on the battery light comes on and the voltage gauge drops between 9 & 14. Then it slowly goes up to around 14. I replaced the battery. Alternator??


take volt meter check voltage on batt.while truck is idling,voltage should be between 13.5-14.5v,turn headlights on it should stay in that range if it goes below,check for bad wire connection at alt.,if conn. are ok,theres a good chance alt. not charging properly!before doing test make sure batt.is full charge!

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2 Answers

Idle Problem when you slow down of come to a stop idle goes low


THis has happened to me in the past. My fix was to clean the throttle body. The problem began after my battery died. The computer was defaulted back to its original settings after replacing the battery. Once I cleaned the throttle body, everything was fine. This happened at about 85,000 miles.

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