Question about 1992 Mercury Grand Marquis
If you remove the starter from the car, and use jumper wires/cables make it hot, and crank the switch and it turns properly whilst it is lying on the driveway, I would take a large screwdriver and reach inside the starter hole in the bell housing and see if the engine will turn over with the screwdriver prying on the ring gear.
Some other problems I've seen on my Fords/Mercurys were:
Bad solenoid between the battery and the starter. Rotten battery cables with the corrosion inside the battery cable under the red or black plastic cover where you cannot see it.
Posted on Oct 17, 2013
Because starter motors require 100 times as much current as those other items the connections to the starter motor and battery and starter relay must be very good and the battery wires must be good not all corroded on the inside. take every connection apart and clean surfaces with sand paper. Baking soda in water can be helpful to soak cable ends at battery.
Follow the positive lead from the battery (it will connect either to the solenoid on the starter or a starter relay mounted to wheel well. Clean those connections and check wires. If you have starter relay use a medium sized wire to momentarily connect the terminal with bat wire attached to one of the small terminals on relay. If nothing happens connect jumper from bat terminal of starter relay to the other small post on the relay supplying 12 volts to the correct small terminal will close the starter relay and send full battery power out the other big terminal on relay which connects to starter motor causing the starter motor to run.
If the starter relay does not click and the starter motor does not run the relay is bad. If POS battery cable goes to the solenoid mounted on the starter motor Try Jumping the terminal where the battery connects to the solenoid to the small terminal on solenoid. If nothing happens the solenoid is bad.
I think you have first example with starter relay. Check it and if nothing happens replace it.
Posted on Oct 17, 2013
Change the actual ignition switch? Test light at starter signal wire while someone turns key to see if you have power at signal wire. Check all your grounds after that. Still nothing take steering column apart and change ignition switch .
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
CHECK BATTERY CABLES AND FOR CORROSION,A BAD GROUND OR BAD CONNECTION WILL CREATE ENOUGH RESISTANCE TO PREVENT STARTER TO CRANK OVER ENGINE. IF BATTERY HAS 12V DOESN'T MEAN IT'S GOOD,IT COULD HAVE ON 100 CCA'S, NOT ENOUGH.
Posted on Jul 13, 2009
Heres a good test to test the solenoid and the starter, make sure the car is in park and turn the key on, using a screw driver jump the solenoid and see if it spins the engine or clicks, if you look at the solenoid you will see a small wire and the two connections for battery cables,locate the connection that the battery goes to ,the other big connection will be the cable to starter, take the battery connection and jump it to the small wire connection, if it clicks then you must have a bad starter or bad connection at the starter, also another test is to turn the headlights on and try to start the car while someone watches the lights, if the lights go out then you have a bad connection at battery or the ground to engine. start with these tests and let me know what happens, good luck.
Posted on Mar 05, 2011
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Ok it seems you isolated and checked the usual suspects and some that I wouldn't have looked at except one. Did you check the neutral safety switch and Alignment on your gears for the gearshift lever. If it is not aligned properly it may not be hitting the neutral safety switch when in neutral and park. Also if the switch has failed. It may not be allowing your system to start when you move the key to the start position. I'm also wondering if this model has a fusable link in the starter cable but you say that you've isolated and tested both the starter and the relay. So I would really suspect that neutral safety switch. Hope this helps.
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