E.E.C. relay causing power draw and killing my battery

It is specific to that engine.

Test the amps draw of the pump circuit in case it's drawing too much causing heat in the relay contacts making them stick when engine is off .

Improved Methods to Find Parasitic Draw Battery Drains Overnight

The BEST Way TO Perform Parasitic Draw Test

Chevrolet Truck Battery Dies Overnight Part

Watch all of these !

When you say NOTHING on, are you saying no radio or interior light? No light on in the boot (trunk) and no sidelights? If this is the case then a 5 amp drain does sound a little odd.

That said 5 amps should not be a great drain on the battery. If you have a 70 amper hour battery (Obviously, I don't know what car and rating battery you have, so I just took a general stab at a Mitsubishi Charisma which has a 70ah battery) then a 5 amp drain should take 14 hours to kill it stone dead. I imagine that 5 hours would put it in a pretty poor condition and 10 hours would probably have discharged it to the point where all your lights are dim and the vehicle wont turn over on the starter motor.

It does sound like you have something draining moe power than would be expected

No, your explorer will have cam and crank sensor, coil packs, and the computer.

If it's a powered subwoofer yes. Powered subs draw alot of power, and if you wired it direct, yes it can drain your battery down. You need to wire it to a source that is powered only when key is on.

A loose positive battery cable connection will kill a battery in short order. Tighten all the connections including the starter (usually hard to get at - and most likely the culprit).

It is a good idea to check the cables periodically for corrosion, this can also kill your battery. Once you have made sure the connections are free of corrosion and have a tight fit you can recharge your battery or replace it with a new one if the battery is damaged from being undercharged.

Another thing that will kill your battery is the charging system voltage regulator - if it dies your battery will run out of power just running the engine. Modern cars have this part in the alternator and you may or may not be able to replace the regulator. Take your alternator to a parts store or a shop and have it tested. If it is bad and you put a new battery in the car, the new battery will die.

If all that happens than i think you should take it in because a short could lead to more problems

wow 3 batteries in 3 months???? undo the positive battery cable & connect a test light in between the + cable & the + battery. the light will go on if there is a draw, start pulling the fuses out one at a time until the light goes out then you know what circuit the problem is on. make sure you take the interior light out as the door being open will cause the test light to go on. This is called a parasidic loss..

try 91 oct gas bout 3 tanks to clean up fuel