I have an 86 toyota pcickup battery charge light is on have good battery and replaced alternator twice.

12.3 volts & a battery over 4 years old or newer-- it's bad

CHECK IGNITION FUSE TO ALTERNATOR.

hello, it sounds like the alternator is the problem, most auto parts stores can check the alternator/charging system at no charge without removing it from the truck, I'm sure you will find that the alternator needs to be replaced.

Hello and welcome to FixYa!

As a first course of action, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.

You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.

Hope this helps and thank you for using FixYa! Have a good one!

Hi Darren,
The problem is with the regulator. Try and get a solid state electronic replacement of good quality from a known manufacturer. Once a good replacement has been found your problem is solved, I promise.
Regards Johngee10

CHECK . check for faulty terminal ends connected to alternator...

ITS EITHER ALTERNATOR OR ALTERNATOR WIRES BROKEN OR DAMAGED.IF ALTERNATOR WIRES LOOKS OKAY.I WOULD REPLACE ALTERNATOR AND BATTERY CABLES.WHEN BATTERY LIGHT COMES ON ALTERNATOR IS NOT CHARGING BATTERY.REPLACING BATTERY TWICE A YEAR IS CHARGING PROBLEM.ALTERNATOR NOT DOING ITS JOB.IF YOU BUY ANOTHER ALTERNATOR BUY CORRECT AMP ALTERNATOR BUY WHAT FACTORY PUT IN.

check ur alternator its wht charges battery. tip start car and disconnect pos battery cable if car dies change alt..good luck

Your alternator is not producing current to recharge the battery. Check to see the belt is on and properly tightened. Make sure your battery connections are clean and tight. If the belt and battery are good, remove the alternator and have it checked for output. Most likely will need to be replaced.

clean battery terminals ,bring battery to be tested after charging, after reinstalling battery run car and test alternator output it should be a minimum of 13-14volts if it is under 13 replace alternator , use a voltmeter set on 12 volt 10 amp dc to check the wire to check is located on the back of the alternator covered with a rubber grommet of course hold negative wirw on volt meter to ground and touch red wire to big terminal on back of alternator while car is running should have 14 volts or at least 13 volts