Question about Cars & Trucks
Just does not fire up even tried easy start to help it byt still not fireing up alternator showing on dash
Posted by Anonymous on
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Posted on Jan 02, 2017
I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it.
The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator.
The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.
Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only.
This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.
Posted on Oct 03, 2008
SOURCE: truck won't start
You should check your battery cables with an ohmmeter and see if they have any resistance,they should be at 0 ohms or just alittle over,but could possibly be the starter solenoid also.I had this same problem with my Toyota last year,hard starting sometimes needed a jump and then the alt went bad,turned out to be the solenoid was shorting intermittantly.Hope this helps.
Posted on May 05, 2009
Check to make sure that there's power from the alternator to the battery on the charge-back wire. If nothing's there, then your alternator is junk and you'll have to replace it again.
Posted on May 21, 2009
The battery (or IGN) indicator on the dash, when lit, indicates that the alternator is not charging.
Check the battery terminals are not corroded, and the battery +12V and earth connections to the vehicle are in good order.
Check battery electrolyte lvel is ok.
Check the battery terminal voltage - it should be 13.8volts to 14.5 volts with the engine running. Switching on the headlights should not cause any reduction in that voltage while the engine is running.
The battery will not charge significantly unless the terminal voltge is in excess of 13.0V.
If all the above test ok, and the battery discharges between daily vehicle uses you may need a new battery.
Posted on Jun 17, 2009
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