Question about Cars & Trucks
If it is intermitant, it could be the brushes in the alternator are sticking and losing contact with the armature. The other problem it could be is the excite wire going to the alternator may be corroded, that is the smaller wire that is on a plug in connector.
Posted on Feb 09, 2012
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Posted on Jan 02, 2017
Check the ground cable at both ends for a good tight and clean connection. also check that the alternator is grounded. You don't say if the battery goes dead over night or how you think it is not charging but if it takes over night. You need to check for a draw on the battery. You can do this by making sure all doors etc. are closed and things are off. Then disconnect the negative cable from the battery and hook a test light between the battery and the cable end, if it lights you have a draw. Something is on and draining the battery. Then you have to find what is draining the battery. You can pull fuses one at a time to find the circuit and go from there to pinpoint the cause
Posted on Dec 20, 2009
SOURCE: Altenator issues
Kenneth, have you checked amperage draw on this vehicle? To me, it sounds like you have a component that is staying powered up even with the key off, which could be a component issue or a wiring issue.
You should check for an amperage draw with the key off by doing the following:
Be sure that key is off. You will disconnect the negative battery terminal and connect a Digital Volt/Ohm Meter (DVOM) with the black lead on the battery terminal and the red lead on the cable end ( the cable should not be touching the battery at this point).
Set your DVOM to the amp setting (A) and check what the meter reads. You should wait at least 2-3 minutes before you get an accurate reading as some components, such as the engine computer, may take a few minutes to power down fully. You should see a 0A reading at this point- if not, you have a big draw and should not continue to prevent damage to your DVOM.
If you are reading 0 in the A scale, switch to the miliamp (mA) scale. You should see less than 500 mA (0.5A) reading- this is a general rule of thumb as some things, such as clock memory, radio memory, ECU memory, etc will create some draw, but even 0.5A draw will take several days to draw a battery dead.
This will at least tell you if you have a parasitic draw on the battery causing it to go dead.
Hope this is helpful!!
ASE Master Technician with L1 and X1 certs, Nissan Certified Scope Technician, Chrysler Certified Level 3 Silver Technician- 12+ years experience.
Posted on Nov 17, 2008
SOURCE: Charging problem
It could possibly be the earth cables from the battery, if the circuit is not made then it will not charge the battery, try to find all points were there is a wire that is bolted to the chasis remove them and clean them up, using a bit of vasaline when you re-fit the bolts would help to create a better current as well.
Posted on Jan 19, 2009
lf you have replacement cable ends on your battery, check that wires are not corroded under the straps. Also check alternator ground (run a ground wire directly to the alt case) I have seen "lazy" regulators at times but this is very rare. Also make sure drivebelt is tight enough to prevent slipping. Has your battery been charged and load tested?
Posted on Mar 29, 2009
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