What should the voltage drop be on an alternator?
What should the voltage drop be on an alternator?
If you can ohm your cables, anything over 0.5 drop and the cable is internally corroded. Voltage drop should not be more than 1% per linear foot of cable (0.14-ish). We generally use the 0.5 number because it’s usually the crossover cable which goes.
What should I do if my alternator is not charging?
Still no signal to tell the alternator to charge. They put the alternator on a bench charge and it was good, said they load tested the batteries and they were both fine. Powered the alternator up by an external power source??? and then he said the gauge went right up to 14.5v.
Where do the wires come from in an alternator?
They said they have OHM tested the two wires coming from the ECM to the alternator and they are good. He even inserted two different wires in the wire ports where the alternator wires come from the ecm to bypass the wires all together. Still no signal to tell the alternator to charge.
Where is the charge wire on a Dodge alternator?
There is a Black/Grey Wire between the Gen/Alt and the PDC which contains the 140amp fuse and then a red wire to the battery. This is the large charge wire that electricity flows from the Gen/Alt to the 140amp fuse in the PDC and onto the battery.
How many volts does the new alternator have?
Replaced the 2 wire connector that talks to the computer. Now low side is 14.2 volts high side is 14.6 volts. Very happy with the new alt. Click to expand…
Why is the battery light still on after a new alternator?
So, now truck has new alternator and battery BUT battery light is still staying on. I had them check both and they said, new battery and alt showing good. I know all of the connections are tight and I checked the fuses inside the truck and all are good.
Where is the PCM located on a Dodge alternator?
This is where the PCM lives behind your air filter box, notice I removed mine for better access, TURN THE KEY OFF before disconnecting. The connector closest to the passenger side is the Grey C3 connector. The Connector in the middle is the White C2 connector. Reference the wiring diagram at the PCM.
Ideally, the voltage drop across any connection should be zero, or less than 0.1 volts. Check for voltage drops at the positive and negative battery cable connections, the alternator BAT+ power connection and the engine ground strap(s).
What causes low charging output and alternator failure?
Poor ground connections are an often-overlooked cause of low charging output and alternator failure. Voltage drops on the positive side of the charging circuit can cause undercharging. Voltage drops on the negative side can cause overcharging.
What happens when the diodes in an alternator go bad?
Alternators use diodes to rectify alternating current produced by the alternator into direct current. When one or more diodes go bad, the alternator can cause all kinds of problems. AC voltage leak can cause your lights to dim and drain power from your battery, for example.
What should one wire alternator output be at idle?
Crank the engine while probing the battery posts. It should not go under ~10.5vdc at least. When the engine is at idle, 14.0 -13.8 vdc. Stop engine. Disconnect the alternator lead And start the engine. From the alternator output to the ground should be at least 13.5-14.0vdc.
Poor ground connections are an often-overlooked cause of low charging output and alternator failure. Voltage drops on the positive side of the charging circuit can cause undercharging. Voltage drops on the negative side can cause overcharging.
Ideally, the voltage drop across any connection should be zero, or less than 0.1 volts. Check for voltage drops at the positive and negative battery cable connections, the alternator BAT+ power connection and the engine ground strap(s).
What causes a radiator alternator to stop working?
A closer observation of the radiator will reveal a system of pulleys or belts that work to convert mechanical energy into electrical energy. The alternator will stop working the moment your belt wears out and breaks or the pulley becomes damaged. These items are easy to replace. 3. Faulty fuse Fuses blow up due to a power surge or they wear out.
What happens when the alternator of a car is dead?
The alternator and the car’s battery work hand in hand. A good battery should give you service for the next five years before its lifespan ends. If your battery is dead, then it will not give power to the car’s alternator. The alternator normally lasts longer than the battery.
