Question about Cars & Trucks
The computer controls alternator output. If the alternator passes a bench test but is not charging at idle speed on the car, it could be the computer or a bad connection in the harness.
Posted on Jan 11, 2013
SOURCE: 2000 Chrysler Concorde
The alternator has semiconductor diodes to change the AC it generates into DC for charging and operation of the electrical system.
These diodes can fail 'a little' meaning that their reverse resistance falls below its normal level, which is very high and will only allow a few microamps to flow, a level of discharge lower than that your other electronics such as clock and digital odometer functions draw and insignificant to the battery's health.
If you have a multimeter with a 10 Amp range, something very common even on the cheapest digitals via a separate unfused jack, you can remove your negative battery clamp, insert the meter (set for that separate range), black lead on the clamp, red on the battery terminal, and measure current draw with the engine off.
Note: Fasten one lead firmly and the other, tap only until you can see whether the drain is greater than 10 Amps. If is much greater, it will destroy the meter bbut briefly connecting shouldn't hurt it.
These meters can be had in auto parts stores, Radio Shack (in the US) or other electronic suppliers. If in the US, you might check for Harbor Freight tool stores in your area; I have bought several of these handy meters for $3 US there.
Posted on Dec 30, 2008
You will need to disengage the Negative terminal (Black side) and then the Red (positive side). In addition, there might be a securing bracket with two bolts or wing nuts, loosen these and the rods can be pushed down and twist out of the bottom. Once this is done remove the battery and head to your local Auto parts store, they can help you select the correct one. re-assemble as you have taken apart. you will need to re program your stereo and reset your clock, (prior to removing terminals) make sure there are no special lock out codes for your stereo. Good luck!
Posted on Sep 12, 2009
Fig. Wiring and nut locations
Posted on Nov 03, 2009
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