Mercedes-Benz 350SDL Questions

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How do I find the antenna wire, where inside body?
Driveway also has rust stains under car (front). Possibly related?
We recently had the motor changed out on the car. We also had to replace ignition tumbler with new keys. When doing so the dash was taken apart and we found where all goes except where to plug in the transmission lock down cable that goes into the ignition system ?(that's what I'm calling it so I'm not sure if that's the right word.)
Car has 263k . No smoke issue and this car sits around a lot. May put 3k on it per year
just started
fuel pump on left side of engine has a leak
Son has a 1981 300SD that cranks but will not start. We have checked the fuel lines, changed filters, primed, checked glow plugs, glow plug wires, fuel comes out of injector pump, comes out of the fuel lines at the injectors, we drained the tank and checked the screen at the bottom of the tank. Replaced the starter that was drawing 300 rather than the 190 that was recomended. New battery, checked the relay switches, tried starter fluid. The car ran when it was parked after being in Green Bay for several weeks so it made the 8 hour trip just fine a year ago last fall so it sat for 18 months and now cranks over occasionally sounds like it wants to start but does not follow through. thanks
The pump is off the engine.
The problem happens after driving at higway speeds for apbout a hour then the transmission will downshift onto lower gears and will not go back into 4th
Is there an access panel under the mat in the trunk?
Driver side door lock is jammed so that the key won't turn, lock or unlock. The lock itself works when locking from the passenger door. Tried jiggling, but no effect. Anybody else have this problem? Thanks!
I found only one fuel filter on the front of the engine. It was simple enough to replace, but I failed to fill the new filter with fuel first. I have cranked the engine enough that the new filter has fuel, but it will not start. Loosened the output hose while cranking and I did get some air out of the line, but it still will not start. Any suggestions would be nice.
It had not been driven for a year. The Battery was replaced 6 months ago, along with the spark plugs. The glow plug indicator does not turn on on the dashboard anymore.
My issue is it will turn over (crank) but not start.
The first try it only turned over but wouldn't start so we fully changed the battery and it did start. we drove it 500 miles, turning it on and off at rest stops and to fill the gas tank up. But once we parked it for the night it would not start the next day, only turning over (crank) but not start. Any sugestions? We are currently rechanging to battery again fully. But not sure if something is draining it over night, or something else?
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