Another simple test is to check your interior lights.If the truck stops, then you most likely have a problem with the alternator. A simple test to check the alternator is by running your truck and then unplugging the positive connection of the battery.If the truck runs and continues to run, then it's likely the problem is with the battery. If the alternator is failing to charge the system, the truck will soon die again and the problem has been pinpointed. Jump-start the truck and then remove the cables as quickly as possible.The hot wire scent can be caused by an overheated alternator, one pushing too much power through the rotor and stator. The scent of burning rubber or hot wires will often accompany alternator failure.Try to start the engine and listen carefully, if it produces a "whining" sound, it may be the alternator.If the battery is working properly and nothing is wrong with it, then it's the alternator that will more likely cause a problem. Test the alternator to make sure that it can start up the battery. If a fully-charged battery is still pulling 20 or more amps after five minutes of idling, the battery is defective and needs to be replaced. The charging current should likewise taper off to less than 10 amps at idle (with no lights or accessories on) after five minutes of running. The battery charging output should jump about two volts after starting the engine (14.5 volts or higher), then gradually decrease after the engine has been running for several minutes (unless the battery is really low). This can overload the charging system and lead to premature alternator failure. This, in turn, makes the alternator keep charging the battery at a higher than normal rate. If the battery just won't keep a charge even when you have turned off all accessories, then it's time to take a look at the other systems that work with the battery to run your car.ĭiagnostic Tip: If the alternator on your car has failed, it might mean your battery is not building up to normal resistance as it accepts a charge. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring, or the alternator. If the voltmeter reads between 14-15 volts then the battery is normal. Then turn on the engine again and check the battery. It should read close to 12.6 volts when the car is off. Check the battery voltage with a voltmeter.A bad battery will NOT accept or hold a charge, while a good battery can be recharged and returned to service. Clean off any corrosion and check to see whether the battery will charge up again.Switch them all off and try the battery again. Check the connections you commonly use, like automatic window openers, windshield wipers, and the brake lights.If there is a dim flickering light, then it means that something is using up power from the battery. Check the battery gauge on the dashboard to determine if the battery is sending a charge even when you have turned the truck off.Consider the situation: If it's cold out, if you left your car lights on the night before, the battery could have just temporarily died.Try to start the engine and listen carefully, if it only produces a "click" sound, it may be the battery.And in cold weather, it's very common to have a dead battery that just won't start. Batteries usually only last three to five years, so if your battery is 3 or more years older and is not holding a charge (keeps running down), or it does not seem to crank your engine a normal speed, you probably need a new battery. Start by checking the battery in your medium-duty truck. If your battery or alternator in your import truck just gives out one day, would you be able to determine which it is? It is not easy finding out exactly which part of your truck is giving you the trouble, but here are a few tips that can help you in figuring out whether you have car battery problems or alternator problems.
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