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The battery light only comes on when there is a problem with the alternator or the charging circuit. Check all the wires, fusable links and connections. Also a good alternator test will put a large load on the alternator and read the diode tree.
How do you know it's only putting out about 1/2 ? an 1/2 what ? Amps or volts ? Did you hook up a volt meter to the battery posts ? red to red an black lead to negative post of the battery ? Does it show 13.1 to 14. 1 volts with the engine running , if so it's charging . The only thing that would cause the alternator not to put out full charge amps would be a bad diode inside the alternator or a power or ground issue. You need to check power an grounds doing a voltage drop test . Voltage Drop Testing the Charging System
No doubt, you have lost a connection. It's most likely a ground connection because the rear of the car gets the most abuse from rain, road grime, rocks, etc. Specifically, use a 12 volt trouble light to find the red or black power line. Ground wires are green. If you can't get 12 volts using the ground to a 12 volt source you've found your problem. Unless you're familiar with electrical systems you should be able to find a local car mechanic to help. If you DO know about electrical then replace the ground wire if it's not getting a good ground.
I think that more than likely wher eit draws the power in the fuse box the circuit feed to the fuse is burnt out ,this is often a strip on the back of the fuse box that runs across the frrd to the fuses so check for a feed in the fuse box on the fuse for the power seat
What is the condition of the bulb socket? Contacts show signs of corrosion or overheating? Use a meter to find out if it's missing the 12 volts to the bulb or if the ground is missing (open/high resistance). With the fog lamps powered on, connect the black meter lead to a good solid ground on the body of the car. Touch the red meter lead to each contact in the socket which the bulb plugs into. One of the contacts should measure about 12 volts. If no 12 volts then you will need to check fuses and wiring to find the open circuit causing the no voltage situation. If you measure 12 volts, then you know you have power to the bulb. The problem will then be with the ground. Turn off the fog lamps, set the meter to measure resistance (ohms). Leave the black meter lead connected where it was. Connect the red meter lead to the contact in the bulb socket that you did NOT measure the 12 volts at. The meter should read no/low/minimal resistance. If you measure high resistance, then you will need to locate the corrosion or open/broken wire between the bulb connector and grounding point on the car. Good luck!
Sounds like the starter is bad take it out and take to a local parts house that checks them for free (they must be removed from vehicle). I state that but when you charge the battery you are sure battery is good? You may think the battery is charged but still not providing 12-13 volts. A cheap tester/ohm meter will reveal how many volts at positive and negative terminals.
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if you connected the jumper leads up wrongly you have most likely put 24 volts into the system instead of 12 volts & damaged all of the electric components including the computer, you will need to consult an auto electrician to sort out the problem.....hope this helps.....cheers
you should take a look at the switch, it may be shorted work it back and forth,if that don't do it for you then you will want to take the motor out it is ether shorted out or just need cleaning up ,to reduce the amp,draw . hope this helps if you would like any further help feel free to ask.Thank you