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Grab a volt meter and check your battery out. Take a look at the condition of wiring and connections on the battery, alternator and starter. whatever the cause it seems likely the start is not the issue here, often time 'no start' conditions can be linked to a faulty charging system. There is an excellent article available regarding this topic on, http://autoabsolute.ca
CHECK THE INSTRUMENT CLUSTER FOR POWER TO GAUGES TO SEE IF THEY WORK WHILE IGNITION IS IN THE ON POSITION.IF NO CHECK THE 40 AMP IGNITION FUSE.IF FUSE GOOD IGNITION SWITCH IS BAD OR HAS A LOOSE OR BROKEN WIRE.IF FUSE GOOD ALL GAUGES IS WORKING.I BE LOOKING AT STARTER AND STARTER SOLENOID.REMOVE THEM HAVE AUTO ZONE TEST STARTER.OR YOU CAN GET A REMOTE STARTER SWITCH AND SET OF BATTERY CABLES.HOOK BATTERY CABLES TO A BATTERY.WITH STARTER OUT OF CAR TAKE BATTERY CABLES HOOK NEGATIVE BATTERY TO STARTER BODY FOR GOOD GROUND.TAKE POSITIVE BATTERY CABLE HOOK TO STARTER POSITIVE TERMINAL WHERE POSITIVE BATTERY CABLE GOES.THEN HOOK THE REMOTE SWITCH RED WIRE TO STARTER POSITIVE TERMINAL AND THE OTHER REMOTE SWITCH WIRE TO THE S OR SWITCH TERMINAL ON STARTER SOLENOID.PRESS THE REMOTE SWITCH IS STARTER RUNS GOOD WITH NO FUNNY NOISES ITS GOOD IF STARTER DONT RUN THE STARTER SOLENOID OR STARTER IS BAD. THE PROBLEMS IN YOUR CAR COULD BE A BAD KEY TRY ANOTHER KEY YOUR CAR HAS THE THEFT DETERRENT MODULE SYSTEM BEST TO HAVE CAR SCAN TO CHECK THE THEFT SECURITY MODULE AND THE TRANSMISSION NEUTRAL SAFETY SWITCH IF ITS BAD STARTER WONT WORK.ALSO CHECK THE THEFT DETERRENT MODULE RELAY. BEFORE REMOVING BATTERY CABLES TURN OFF RADIO SO YOU WONT LOSE YOUR RADIO PLAYING CODE.
if its a manuel trans it could have a bad clutch switch.an automatic trans could have a bad nuetral safety switch. both can also be just out of adjustment also.its also possible the ignition switch is bad or out of adjusment by loose mount screws or brohen switch linkage.try this MAKE SURE ATOUTRANS IN PARK AND WHEELS CHOCKED BRAKES SET,SAME GOES FOR MAN. TRANS.. the starter relay also called solonoid on fords is on the inner fender near battery. there are two large cables, one to the battery other to starter. there are two smaller terminals inbetween the two lare ones. turn the key to on, take a jumper wire and touch the stud that has the cable that goes to battery positive then touch the other end [while its still touching the pos cable] to the smasll terminal that is closest to the battery pos,there right next to each other. dont worry if somehow you touch the wrong little terminal it wont hurt anything it just wont crank.if it turns over then your problem will be one of the above mentioned possibiltys.
IF YOU HAVE A POINTS TYPE DISTRIBUTER, THE WIRING WILL BE: TO ENERGIZE THE STARTER SOLENOID A LARGE, ABOUT A NUMBER 12 OR 14 GAUGE WIRE WILL GO TO THE INNER MOST SMALL TERMINAL ON THE STARTER SOLENOID. IT MAY BE PURPLE IN COLOR. THE SECOND SMALLER WIRE SHOULD GO TO THE OUTER SOLENOID TERMINAL AND GO FROM THERE TO THE + TERMINAL ON THE IGNITION COIL. THIS IS FOR BY PASSING THE RESISTOR WIRE FROM THE STARTER IGNITION SWITCH. THE LARGER BATTERY CABLE WILL GO TO THE UPPER TERMINAL ON THE STARTER SOLENOID. THERE MAY BE AN ADDITIONAL BATTERY FEED WIRE TAKE OFF FROM THE STARTER BATTERY TERMINAL POST ON THE SOLENOID FOR OTHER ACCESSORIES. THIS TYPE OF SYSTEM (POINTS TYPE) WAS TYPICALLY DONE AWAY WITH IN 1975 WHEN THE HEI DISTRIBUTOR CAME OUT.
Let's keep things simple to start with... Check the battery that it has sufficient charge. (I did say to keep it simple). Ensure the gear selector is in Park or Neutral if equipped with an automatic trans, or depress the clutch pedal if equipped with a manual trans.
Lastly, in keeping things simple... check all the fuses and fuse links (special fusible wire) that power is available to your vehicle's electrical system.
With a test light, check the starter relay with the key in start position is energising the starter relay... bypass the starter relay if no power is present. if the starter operates, you now know the problem is located within the start control circuit (from the key switch through the starter relay to ground via a neutral safety switch (auto) or clutch switch (Manual).
finding the fault should be quick with a circuit diagram.