1993 ford escort. If car sit more than a day the
Parasite drain? Keep in mind that all vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw. It is always a very low draw so it doesn't run the battery down.
In order to check for parasitic draw, you need to be careful so you don't ruin your meter. At the risk of sounding like an elementary teacher, here's what you need to do:
1.- Remove all the cables from the battery clean them thouroughly and clean
the terminals. as far as practical remove the followinig cables from the
vehicle and inspect them for damage and good clean contacts. Earth
cable (ones from battery- body and body-engine or vice versa) main
starter cable and the main alternator-battery charging cable, with these
cables cleaned and replaced do the following;
2.- Disconnect the earth lead from the battery and connect the earth
terminal to the meter/gauge and then earth the other terminal to the
chassis or engine part.
3.- Note the reading on the guage and pull fuses one at a time and
replace them when you see the meter reading drop you have found the
circut that has the leak, if you can live without it leave the fuse out
or grab the manual find ou what is on that circut that could be causing
the problem and remove that item or have it repaired. (some circuts will
draw a minor current even when everything is off for example a98 V8
discovery with ABS, electronic everything has a .4 amp draw on the
battery with everything off)
4.- If this gives no result disconnet the main charging lead from teh
back of the alternator and check the meter, if this is the problem buy a
new alternator or if your vehicle is fitted with an external voltage
regulator have that fixed.
A few things that would cause the battery to go down are:
1. A bad battery, I have seen "bad" NEW batteries too, so just because it is "new" it could be faulty.
2. The alternator is not producing enough electricity to keep the battery fully charged.
3. The belt on the alternator is slipping, and not turning the alternator fast enough, you will usually hear a high pitched squealing noise as the belt slips and spins excessively.
4. Loose or dirty battery cables, if you can move the battery cables on the battery with your bare hands, they are loose and need to be tightened. (Don't touch a battery with you hands that have rings on them... I have a nice scare on my wedding ring finger where I touched a battery).
5. Loose cables and "grounds" at the alternator and or battery, have your friend check all wires from the battery to the alternator and make sure they are tight and have clean connections.
6. A bad alternator, you installed a used alternator, maybe that alternator has failed?
7. Something is "draining" electricity from the battery. There could be something that is sucking too much battery power, and the alternator can not keep electrical output supply up with demand. A/C, electric cooling fans, after market radios and high powered amplifiers are a few things that come to mind.
I would recheck everything that you have already done.
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