During summer time it started to slowly drain my battery until it barely would start then I bought a new battery., there are no upgrades to my jeep. it drained my new battery then I replaced the altenator and jumped from wifes car and started up and ran fine .so shut it off and then replaced my power steering pump because I broke off hose nipple on pump resivour loosining belt after I got it all back together it would not start .When I turned the key there is nothing but head lights and dash lights no sound of relay to starter., so i took power pack and grnd starter and jumped it, selinoid kicked in but did not turn over motor key was in start position ??????also replaced relays .
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If the code reader cannot read the pcm then it definitely needs to be repaired. When you turn on the ignition, does the check engine light come on, in the dash? If not, the pcm/ecu is in need of repair.
If you are not using the vehicle except during the summer, You should really have a battery tender (2amp automatic charger) attached to it. There are normal items that will otherwise drain the battery over an extended period of time (radio and clock to mention one). If you jump started it when you found the battery to be dead, it's possible to have the alternator fail as it cannot charge a dead battery (alternators are designed to maintain the state of charge, not re-charge. If "requested" to re-charge they will run full on and eventually burn out). Auto stores often do not have experienced help. Therefore, it's possible that your alternator may still be OK. First, completely re-charge the battery and have it load tested to make sure it's good. Then, do a quick check using a volt meter. Running voltage measured at the battery terminals should be between 13 and 14 volts. You should see a drop with all accessories on including headlights on high, but the voltage should not creep downward even after fifteen minutes. If after running, you start seeing numbers below 12.9 the alternator or regulator is bad. (regulator is part of the computer so hopefully it's not bad). Good luck!!
If you disconnect the negative battery cable and connect a 12V test light between the battery negative post and the negative battery cable terminal the light will burn if there's a draw. Make sure all electrical consumers are off and all doors closed when doing this draw test. If the light is on start pulling 1 fuse at a time until the light goes out, when it goes out that's the circuit that has the draw. Trace it from there.
It may be the old ford problem of a shorted starter, an internal starter problem will drain your battery over night. Or check for lights on inside the car, also glove compartment lights or under the hood lights.
check for power drain in accessories such as under hood light/glove box light/trunk light sometimes these switches stick on and drain battery-but i would also recheck the battery again if one failed never know could be from same batch
Check the small wire on the starter to see if you are getting 12v there with the key turned. If you are, then it is possible that the starter (&or solenoid) that checked out good last year is not good now. If no power at small wire, then check neutral safety switch.
sounds like you have a wire that has lost or burned off its cover and is grounding out the vehicle and has soon as its power is cut the wire breaks free from the bare metal and thats why you can immediatly start the vehicle