Question about Cars & Trucks
Car charging fine just light on
Charging lights work on the principle of a balanced current throughn the bulb. no charge and the current flows from the battery through the bulb to the alternator. conversly when the alternator is charging at 13.5 volts or better the current is flowing back through the bulb. this opposing current puts out the bulb 12 volt batteries arte in fact 13 volts and alternators charge at 13.8 to 15 volts the 2 odd volts difference is not enough to make the bulb light up. Knowing this it means that some where you have an open circuit that is allowing I suspect battery voltage to make the bulb work. So I would be checking the wiring at the back of the alternator especially the continuinty of the 2 small wires in the connector as I suspect one may be broken in the platsic covering at the fitting The heavier lead is the one that carries the charge directly to the battery
Posted on Jan 06, 2013
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Posted on Jan 02, 2017
Did you hear the one about the Terrano with a charging problem?
Just fix it by replacing the thermostat!
Seriously - check your temperature gauge does it take ages for the needle to barely get off cold? (and is the heater useless?)
The needle should get to just below half way in 2 or 3 minutes.
If the thermostat is stuck open, then the engine does not get up to temperature.
The glow plug control senses the engine temperature is cold, so the glow plugs stay on for an extended period of time (sometimes 10 to 15 minutes) - short trips particularly in winter, with more headlight driving - the alternator can't keep up with the current being drawn off and from time to time you will end up with a flat battery!
A thermostat is cheap, and easy to replace (three bolts and about a half litre of coolant - I pumped the coolant from the top of the radiator, and didn't spill a drop when the thermostat housing was removed).
Sure enough, as the engine temperature reached about 50C, the glow plugs turned off.
Posted on Jul 21, 2009
check for blown fuse,burnt bulb (some models used the bulbs in series with the alternator field wire ,or the field wire itself
Posted on Oct 16, 2009
SOURCE: Saab 93 1.9 tid warning
The easiest way to check is with the car running, disconnect the positve side of the battery, if the car dies, then it is the altenator, if the car keeps running then it is the battery. If you have a volt ohm meter, check the chrge going to the battery you should get between 12 and 14 volts if it is lower than 12 you have an altenator issue. the altenator should always produce enough to charge the battery and run the car at the same time, if not then the battery wears down.
Posted on Mar 13, 2011
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