'90 ford 350 won't turn over

ford starters are subject to heat problems in the starter motor as they are close to the exhaust manifold
There is a heat shield available from ford spares but I found it not to be all that effective
The solution I found was to install an high performance stater ( used for modified engines) and there was no longer a problem

I looked at info for your security system, it is starter motor disable. I didn't see 06 ford Taurus in my database, so I looked at 05.
Battery has a full charge and battery connections all good?
We can usually do some tests to see if starter motor will crank the engine, but, if the security is the problem, it still won't start.
You can check for applicable trouble codes? Try a different key?

Check all cable connections for corrosion and clean everything you have connections from the battery to the starter relay the actual cables to the starter and also check the starters ground strap at the nose of it if it's frayed or broken you found it this is a contact problem and clean and tighten everything do not use wire brushes 4/0 that's 0000 steel wool =liquid wrench=pb blaster will all help the wire brush rips apart the terminals and battery post causing loose connections they must be tight no air gap good luck stephen

engine wont turn over.first check battery volts should be 12.6 volts.if battery volts okay.battery cables corroded need cleaning or replacing.if all is good starter or starter solnoid bad could have faulty clutch pedal posiution switch or transmission neutral safety switch.

I know a lot about fords from the eightys i have an 85 iv;e had it for 23 years runs great Im sure i could help you but you need to give more information about what the problem think about it and get back to me Then i can give you some answers

give the stater motor a whack with a hammer if not that the its your battery its dead just because your lights widows and all work bmw cars are funny that way they require alot of power on initial start up

The ticking is from the stater solnoid it mean its not getting enough voltage. try replacing the cables to the stater they might have corrosion built us insid ethe cables

Check battery voltage (should be at least 12v at battery and starter terminal) If 12v, check to see if you can turn the engine by hand (ign off) If you can't then it's locked up. (internal problem) Also, starter may be defective...just because its in a box, dosen't mean it's good (sad fact)
Hope it's a bad unit...better than a doa engine!!!
Good luck with it!

NEED TO REPLACE STARTER.

hi there this seems that you have some bad teeth on the flywheel the flywheel attaches to your motor and transmission the starter motor rotates and spinns over the motor to start if the teeth are gone in certain areas on the flywheel then the motor wont spin you need to remove the transmission and replace the flywheel ,once replaced then make shure the teeth on the starter motor are new not cammed over as you mentioned was the isue earlier hop this helps let me know ho this works with a vote of fixya thanks for using sutch a helpful website like fixya