My jeep td sport does not start at all, the battery shows full voltage , there is no noise of engine ticking over at all, only a slight clicking noise every so often .

came from engine or something else.446 gsa tank,gas cap,valve vent,solenoid.

The ticking or clicking sound is coming from your Starter Solenoid because it is not getting enough Voltage from the Battery to engage the Starter Drive. It sounds like you have a dead Battery, try recharging your Battery first to see if it holds a full charge or check your Battery with a Volt Meter, when not running it should show at least 11.5-12.5 Volts, which would be enough power to start your car, any lower than that replace the Battery.

The clicking noise you hear is likely the starter relay. (should be identified inside the box cover) You need to check that battery is up to full voltage, terminal connections are clean and secure and that there is 12 volts at the main power lead on the starter and power at the small trigger wire connection at the starter when the key is turned to the start position. If you have that, then very likely the starter needs to be replaced. If not you will need to check wiring and neutral safety switch as well as main fuses in the power distribution center (the box where the clicking relay is, near the battery)

On a high mileage engine you should use 10w 30 NORMAL oil not synthetic.

the clicking sounds like the starter solenoid engaging & disengaging due to low voltage. Battery may have a short. Check voltage with engine off. Should be 12 volts. Engine running 14 volts.

if you've got a few $$ to risk ,try some synthetic oil with new filter ...it often work good for these kind of noise as long as it is not a loud knoking nois ...if it is only a fast clic clic nois it will probably work!

Is starter engaging but is turning the engine slowly then not turning engine? (that's what I'm reading) If so, check both connections at the block and starter. If reading proper voltage 12v or better, check voltage across battery when in "start" if it drops below 9.5v the starter has failed. (you can turn the engine by hand...correct?)

Check battery voltage should be 12v or better with motor off. start engine read voltage again should be 12.9 or better and then turn all accessories on...voltage should be same or slight y less but best would be at least 13v let it idle and volts should not creep downward..
Volts should never be below 12 and never at 14 except for a brief time after startup. Turn engine off and disable ignition system, then check across battery while craqnking. Volts should not go below 9.5. If so, have batt charged and load tested. If good, replace starter. No valid electrical computer testing can be done without a fully charged battery.

it is an issue in the steering column. I am getting my 2005 back today, finally. 2 mechanics and they said they have never seen this issue before!!
The steering wheel has to be pulled off and the part replaced. It is cutting all power to the ignition switch. It is not the starter or the Alternator... it is in the steering column. It should be about 200.00 to fix.
Deb

1. check all bat connections
2. check starter relay
3. check starter/and solenoid