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Hello i have found with Fords this is a common PROBLEM and easy to fix. If this is the problem all you have to do is jack up car just enough to see the back side of the starter and the solenoid they used a push on style connector for the ignition to kick over the starter almost always this wire falls off. My grand parents have 2 of these cars with the 4.6 LT and i ended up soldering the connectors on because they fell off so much. Hope this helps
A healthy battery reading 12.43 should still be capable of cranking an engine fast enough with enough current left over for the fuel and sparks to start - that is assuming the spark plugs, etc. are also in good condition.
An off-load reading of 12.43 means little on it's own and is only one of a number of tests used to determine battery state. The most important test is to measure the battery voltage while the engine is cranking. It is reckoned a healthy battery attached to a healthy engine, starter, ignition system, etc. will ideally read no less than 12 volts - an analogue meter is best for this test.
12 volts is rather optimistic even for a serviceable system. 10 volts is more realistic and some engines will happily start at 9 volts as long as the cranking speed is still good but any lower and either the battery is in a too-low state of charge, is faulty or the starter motor is taking too much current and needs servicing.
the first thing that you should always check is the battery and the starter connection.An excessive resistance of your high amperage circuit is an overlooked problem that can cause your volts to drop in your batteries. Check to see if the cables are corroded, damaged or loose.The connections will need to be connected if you begin to notice that your battery is losing voltage. If you are using an ohmmeter, you may not be getting an accurate reading for your battery. This is because all that this meter will measure is continuity. It does not measure its ability to be able to handle a high amp current load. There are ways around this to be able to get an accurate read on your battery.
A Voltage drop test is the most accurate ways to test the connection on your battery. You will not have to disassemble anything, so it can be done quickly. Get your digital volt meter to test the voltage drop once you have successfully created a load in the circuit that will need to be tested. If your circuit or the connection has too much resistance, then some of your voltage is going flow right on through your digital volt meter. This will give you a voltage reading.
what is the voltage while engaging the starter. 12.4 is low to start with and while trying to start the car it could drop to below 10 volts which is not enough for the starter to turn over. have the battery properly tested.
Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.
I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike
Does engine turn over when key is turned if not check battery, test with a volt meter voltage should be 13 volts or better if voltage is not high enough recharge or replace battery if voltage is goog but engine does not crank check all cables they must be clean not only on battery but on the starter..Oncethose items are completed perform a load test with a load test meter while trying to start car meter should not drop below 12 volts.if you dont have dont have a load test meter. remove starter ,have tested at any autoparts store should be no charge.if you are still haveing problems contact me at firstname.lastname@example.org I will continue to help you.
There are only two problems with electrical circuits. Too much amperage or too little amperage.We have to determine what you have.
An excellent test is to put your test meter red lead on the positive battery post and the black lead on the negative battery post. Crank the engine and record the voltage. Then place the red meter lead on the starter's battery terminal and the black lead on the negative battery post. Again crank the engine and record the voltage. The two voltages should be with in one half volt of each other. If the voltage difference is greater that one half volt, there is a resistance in the circuit, somewhere. I would expect the voltage to drop a volt or two, max
If the voltage dosent drop, there is high resistance resulting in low amperage. If the voltage drops too low then there is low resistance resulting in high amperage.
High resistance=dirty terminals
Low resistance = shorted wire, slow turning cranking motor maybe caused by bad starter, bad battery or hard to turn engine. ( engine bad, alternator or power steering pump bad, a/c pump bad, etc)
Can use head light for test. Turn on lights and note the brightness. Crank engine. If while cranking, the lights stay bright= high resistance.
If lights go dim = low resistance.
sounds like you battery is going, under a load it dies. easy test... get a volt meter put pos probe on the pos side of battery and the neg on the neg, try to start the car, watch the volt meter, if it drops below 10volts and does not recover to 12 volts its no good. this is called a load test. a 12 v battery usually when fully charged is 12.4 volts. also if you dont have access or knowledge, go to the auto store with the battery and they ll do a load test free for you if you ask them. also it sounds like your starter solenoid is sticking, while starting the car have someone beat on the side of the starter with a hammer this will free up the solenoid if its frozen.. good luck