I have a 1986 volvo 240 wagon that im having a major charging issue with. i have replaced the alternator 7 times this week brand new, i have replaced the battery 3 times.

sounds as though you have a bad alternator or a loose alternator belt and the battery is not being charged. while the car is running - check the voltage from the alternator and make sure it is about 13.4 volts DC.

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the engine temp sensor on a 1992 240 (b230f engine) is located on the passenger side of the engine, right next to the oil filter and right above the alternator. good luck :)

sounds like the trunk light switch may have gotten knocked loose .. that would leave the trunk light on all the time and would run the battery down in a few days even if fully charged to start with .. you can take out the trunk light to test that theory .. the alternator will only put out what is needed and thats probably 30 amps with everything on .. to test its maximum capacity you need to hook up an external load and you have to run the engine at a specified RPM ... for a quick test.. if your alternator maintains about 13.2 volts at idle with everything turned on .. then its gererally working ok ..

Yes,the alternator is not working,replace it and it will turn the light off.There is a problem in the alternator.A diode ,or the voltage regulator in the alternator is bad.

it sounds like your throttle positioning sensor unplug it see what happens if nothing changes there you go.

check the ground to the alternator...clean up any rust & the alternator belt may need to be tightened... also make sure to use only bosch or volvo parts!!!

If you can get it running again, get it to an electrical shop where they can test the charging system. If the alternator is still bad, it will continue draining the battery. If it won't run, pull the alternator and take it to a shop that can test it.

Down the side of the Engine where the Alternator is there should be a few wires.
1 goes to the oil pressure sensor
Another few wires go to the Alternator there are 2 circuits one is for charging which is a little thicker which is bolted under a nut & a few smaller wires which do 2 things.There is a low current circuit that applies 12v to one side of the battery lamp on the dash & when the enging is running this 12v is on the lamp & the 12v from the battery is on the other side so the lamp is out .
If the alternater isn't turning 0 volts is coming from the alternator & the Battery lamp is on.
These smaller diameter wires are important for the monitoring & charging the battery.
If you can't get the battery lamp & other monitoring lamps on the dash to illuminate when turning the key around to run not start your going to have battery charging problems.
I suggest you check the black plastic insulation carring these wires in them may be cracked or broken.
I own a few 240 series volvo's & I think I have had just about every electrical problem possible.

you have a power drain somewher.
unplug your battery " positive " , wait a few seconds.
put the connector back to the battery and see if it sparks, if it does there is something shorted out and draining your power. probably your alternator was good.
if there is no sparks thencould be your voltage regulator or your battery.
let me kniow

When you place key into the ignition and turn to "on" position, do you see your alt. light come on? If not, this is the cause of the charging problem. The current has to flow through this light and back to battery to complete the circuit.