If yo have power to both wires at the starter when trying to crank, the starter is failed.
The voltage regulator is in the alternator on that model vehicle
Its a simiconductor device inside of the alternator.
Your alternator is not charging the battery. This could be caused by alot of reasons, such as; 1- the alternator, or built-in voltage regulator is bad. 2 - Your belt that drives the alternator is loose, of glazed. 3 - one of the cables, black(-) or red (+), is loose, or not tight at the battery, or the starter, or alternator. First, with a volt meter. Check battery voltage with engine off, and all accessories off, it should read around 12.5 -13v. Now start engine, and see if voltage output increases - say 14 - 14.5 volts, then put on all accessories with engine running, and should still read around 14v......, , This will tell you the alternator is good.....Tom.
Integrated into the alternator.
it should have the voltage regulator built into the alternator
sounds like a voltage problem batteries or starter motor or earth problem
inside the alternator. check the fusable link at the alternator and at the starter before changing the alternator.
Sometimes; if you operated the vehicle for some time with low voltage it could destroy your starter. Low voltage is the worst enemy of a starter motor.
Alternator is more than likely overcharging the battery. The voltage regulator is bad. It may be built into the alternator.
Voltage Regulator?
The Alternator is not putting out enough voltage. If you recently replaced the alternator with a "new" remanufactured alternator that one could be bad to your truck somewhere to get it tested.
Because the alternator will keep your car running as long as its running Type your answer here...
The voltage regulator has the job of making the voltage 'constant'. In most modern vehicles the regulator is located in the alternator, in older models the regulator is located separate. If your voltage is jumping around a lot then you either have a problem with the battery (batteries stabilize the voltage also)or the charging system (and probably the voltage regulator)
First, I'm not a mechanic, my information is accurate so far as I know but I could be wrong. I will assume you realize that these two devices (alternator & starter) are not dependent on each other. I do not think the alternator needs to be good for the starter to work. If your battery has sufficient charge, then a starter motor in working order will function even with a bad alternator. To see if the starter is working, I believe, at least on older cars, you can hard wire the battery directly to the starter motor to see if it will crank over the engine (make sure the car is not already running). To see if the alternator is working, with the car running, check the voltage. Then run the car for a while with electrical components on (Lights, Radio, Fan, etc.) Then turn the electrical components off and check the battery voltage again. If the voltage has not gone down, your alternator should be working well enough to keep your battery charged. If the voltage has gone down, it should start going up as the alternator charges the battery up to it's designated voltage. (usually about 12v for most cars).
have alternator been checked for voltage output
Voltage flows from the alternator not to it. If it is outputting no voltage it is defective.
Take the car to a repair shop and have them do an electrical systems test. It should include testing the starter for the amount of current dtraw it has. Also the alternator for amperage and voltage output and the state of the alternator. If the battery is low then you will get a bad starter reading.