Changed the Batterys, and there are too many wires. Where do they go?

You give no information on the type name, model , engine of the vehicle. When you say ignition switch are you referring to the switch or the cylinder.. You must give specifics inorder for me to help you.

ohh the 08 diesel is a little tricky , this is because the dual batterys make things tight to reach , if you can possible get your hand down behind the batterys then using a 1/4 turn counter clock wise movement the bulb retainers will come out and the wires do reach up over the batterys , if however you can not reach behind them , then im afraid they have to come out , keep in mind your trans settings and all your learned codes will be lost (plus your radio settings ) when all the batterys are removed
don't forget to re apply a nice silicone Non harding type to the _o- ring seal around bulb or first rain there gonna go out again , and as with most bulbs never touch them with your bare fingers , or get any thing else on them either , use a dry tissue or new tee shirt to handle the bulb

you will need to let us know what your heater is. car , home, RV, or is it a portable unit?

sounds like whatever it is, your igniter is either not getting power or is burnt out, I would check for an inline fuse 1st. if that is blown, replace it with the same type fuse. for instance, the inline fuse on my home gas furnace is a 10 amp fuse, located in line on a red wire inside the cover of the furnace.

Try cleaning, scraping the battery contacts and then put a little petroleum jelly on the contacts and reinstall batteries. If they leaked a bunch then you may have a copper trace or a wire corroded in two.

IT COULD BE THE IGNITION SWITCH, STATOR MOTOR OR WIRING SYSTEM NEED TO BE CHECK.

first check battery for Am and voltage . replace the battry if it's use for more than one year. fix new battery and folow up by drive your's car two kilometer then check battery cable if it;s hot means overcharging . you can check with use head light accilerate if lights more white or more high . voltage regulator must be replace for the alternator .

If you change the battery, and don't plug a 'memory' saver into the cigarette lighter, the result may mean that you have to take the vehicle to the dealer to have the keys and fob programmed to the computer, again.

if it was told to you by the dealer its in the door then it probably is whats called the door module [window switches] they are exspensive and as far as i know a dealer only item

If you have changed the alternator and regulator, about all that could be left would either be a short circuit that is draining current away, or a bad ignition warning light bulb. That is because the power to energize the field of the alternator, comes through this dash bulb.

You have a short to ground.What that means is,you have a power wire...............that is grounding on the vehicle somewhere,or possibly back in the fuel pump.The fuel pump theoretically could be shorted internally causing the problem.It also could be a wire or wires back where you were working possibly got pinched.Disconnect negative battery terminal until problem is solved.