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The alternator getting hot & the bus not start

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Hi, this is one of these faults that the alternator, is INTERNALLY SHORTED or the POSITIVE FEED FROM STARTER MOTOR to the ALTERNATOR to the car (LARGE CABLE). there is a way to test this. take the battery (NEGATIVE LEAD) (as not to short-out the battery cable) off and TAKE OFF the (BOLTED TERMINAL and the second cable) of the SMALLER ALTERNATOR CABLE replace the LARGER CABLE to the (ALTERNATOR and BOLT this ON to determin if the alternator is shorted OR it is the cable from the ALTERNATOR to the CAR FUSEBOX. ( you may need to read this again, not easy).if when the battery is reconnected to the alternator it cools down ALTERNATOR O. K.(then the LARGE CABLE that SUPPLIES the car is SHORTED).


because the battery is connected to the alternator and the alternator is conected to the fusebox. (the battery to alternator is part of the CHARGING CIRCUIT and the alternator regulator is the other part, only when engine running 1500 rev min. gerry

Posted on Sep 11, 2010


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It would be so much easier to read and understand your question, if you use some punctuation and capital letters.

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Hook the battery up or try to jump-start backwards did we?
The ECU fuse gets it's power from the 140 Amp (or 180 Amp, depending on which engine your vehicle is equipped with) ALTERNATOR fuse in the engine compartment fuse block.

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a new battery will read 12.6 volts with a volt meter accross the positive and negative posts - when you start the vehicle the voltage will increase to 13.5 to 15 volts - if you get the increased voltage, then the alternator is working - if you don't then it is not working - the new alternator could be faulty or the wiring could have an open somewhere

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Thats what it sounds like. That would cause all your problems. You could start the jeep and then take your hot side battery terminal off. If it dies asap, your alternator is bad. Hope this helps. Best of luck.

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My 2000 Dodge durango won't start.

How old is the battery? is it going on close to four years? if your not sure i"d change the battery..but if the battery is good eg; dome light on bright, Headlights work, radio good...then it sounds like it might be the alternator.
when your instrument panel says no bus, i'm thinking they mean electrical bus. I think that's what that means...i been caught on the road when the alternator light comes on and then the radio starts to fade and lights start to fade and the care start sputtering and lurching...once the alternator goes... your running on pure battery power and that will usually only last for about 15 minutes enough to get you off the highway...but if your in the desert and you pull off the road and wait for a half hour the battery will recharge and start your car again and you have another 15min to hurry up and get somewhere...this is called battery if you've drivin your car on the battery for a long time like this its bad for the battery and you might still need to purchase a new one. If you put another known good battery perferably 600 to 900 cold cranking amps( the higher the better) and it starts right away quickly take a look at the dash and see if the bus or alternator light goes out...if its on then thats telling you that the alternator is bad and eventually that battery that you just put in will end up like the last one.

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Low voltage

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I would check alternator output first if it is not within the above range you need to replace it

If the alternator is putting out in the range of 13.6 to 14.2 then you need to look elsewhere... you may have something draing the batteries overtime interior lights, electric brake controller for trailor brakes if equipped sound system if anything is getting power without going through a switched circuit this could also be your cause.

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1 Answer

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Removing the two smaller wires stops the exciter current to the alt which stops it charging.
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