1982 toyota pickup i am not getting a charge. my voltage is low. i have changed altenator with one from junk yard, nothing, changed my voltage regulator, changed battery, changed my charge lamp relay nothing. i want to go 4x4, please help wanna get out
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check alternator out put should have 13.5 - 14.5 volts at battery with engine running.if not alernator voltage regulator faulty.any time you see brake light and charging light flashing alternator not putting out enough power to work the antilock brake system.
Charging voltage measured at the battery with the engine running should be 14.5. 12.5 is too low. Since you replaced the alternator, I would start checking connections. Such as where Neg battery cable attaches to chassis and ground strap between engine and frame. On a vehicle this old look for corrosion in the charging circuit cables and connections.
The diagram shows a capacitor between the regulator red wire and ground on some models. If your truck has that cap, you may want to check it or replace it. I don't see anything else on the diagram that could cause this behavior, unless there is a bad connection somewhere. If that red wire powers the field winding, a bad cap could be pulling down the voltage.
new altenator or junkyard one.if new return it, if junkyard just ignore light as its odds on they will not change it .the red light is caused by the difference in the voltage between input and output voltages .Quick test --start engine and run at 1500rpm disconnect battery and turn everything electrical on and if engine stops then change altenator if it stays running then altenator is OK
The brake light combined with the battery light tells me that your alternator is not sufficiently charging the battery. These 2 lights illuminate in tandem when the voltage regulator is not seeing over 12.5 volts. You are going to probably have to replace the alternator, or get it checked & overhauled at an alternator shop.