When I turn the ignition the dash gives a rapid ticking sound (about 4 to 6 ticks a second), the dash lights up like a Christmas tree, but the car doesn't crank at all. I cleaned off the battery posts and connecting wires with baking soda yesterday. I put lithium grease on the posts and wires before reassembling. The car worked fine this morning.
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I have a 300SL and I encountered a similar problem. My dash lights were not coming on, the car was not starting and there was a ticking noise coming from the passenger side(near airbag) when I was trying to start the engine. I noticed that my ignition switch was slightly getting loose. There is an adjustable cover around the ignition key ( like one inch wide) that can be easily tighten by hand. The purpose of this cover is to hold the ignition in the proper place for the electrical contact. It also has a few marks on it which show you if it is properly aligned. By adjusting it to the proper spot, I was able to fix the problem and the car starts just fine right now. Sometime (once in 6 months) it gets loose again and I have to re-tighten it, but it only takes 5 seconds to do so. It seems like the ignition switch is very sensitive on these cars and the smallest misalignment of the switch can make the car not start.
I hope this helps.
When you turn the key and it makes the tick, does it ever turn over at all? If not and it only ticks then it is most likely your starter. You can also test your battery at a local autozone, oreilley, napa, etc. and they can tell you if the battery is the problem. Also if you remove the starter they can typically test them also if you desire.
#2 has nothing to do with engine. It's the courtesy lights and such. #9 is the fuel pump. You'll have to see if you have power to your fuel pump. If it's working you should hear it cut in for a few seconds when you first turn your key to the "on" position. If you hear nothing, it's either burnt out again, or the power wire to it is faulty.