For best info and looking at drawings, we need to know which model of 2005 Voyage you have?
When turning key and getting click, is this a click that is repeated and then clicks again? Click, click, click until you let go of the key?
That can mean that the battery power is getting to the starter solenoid to close the contacts but there is not enough power from the battery to also crank the engine. When both jobs are being done, the solenoid may click without enough power to hold the solenoid, so it drops off. If you are still holding the key, it may then close the solenoid and click but keep doing this over and over.
Do you have a meter to check that good voltage is getting to the big 12Volt cable at the solenoid?
Corrosion or dirty cable connections or weak chassis battery can do this. Does the engine start better if you hold if you hold the battery "boost switch" while cranking? I think this switch may be near the driver's left knee??? That switch uses the solenopid near the door to connect chassis and coach batteries together to let you get a "jump start" without getting out jumper cables! But that solenoid is not normally used when starting if all works correctly. Only needed when we are not getting enough power from the normal starting battery.