First I am not conversant with the specifics of that 300SD. In general, DC likes good clean
grounds, so as you do the install be sure any ground wires are in good order, the terminals
are tight, no fraying, etc. Check the ground connections on the battery. Check all your connections from the battery, all should be squeaky clean. Dielectric grease is a good help
in sealing out corrosion.
That neutral safety switch could be the problem, or the linkage that makes contact could be loose, worn, etc.
Diesel Giant suggests using a Ford starter solenoid. Have you tried bypassing the solenoid?
Good luck, patience pays off.
From: diesel_mercedes@yahoogroups.com [mailto:diesel_mercedes@yahoogroups.com]
Sent: Wednesday, April 27, 2016 9:08 PM
To: diesel_mercedes@yahoogroups.com
Subject: [diesel_mercedes] 1980 300sd will not turn over after short/long drive
We recently acquired a 1980 300sd with about 125k miles on the clock. First time out, we drove about 20 miles to town to get new tires. When the tech tried to start the car, nothing happened. No start, no turn over, no click. Nothing. Tried jumping. Nothing. Personnel pushed the car inside and put on new tires. Pushed car out. Contacted po and was told that the same thing had happened a couple of time in the past. Po said he thought it might be neutral safety switch. Car started after moving gear shift thru the gears several times. Ordered new switch. New switch came yesterday. No time to put it on. Drove car to town today and after refueling it would not start. Moved thru the gears many many time. No start. After several hours returned and the car started right up. Sounds like something electrical is heating up and not working. Does the neutral safety switch have any electronics inside? Could the started/solenoid be getting hot from driving? In the morning I am going to put the new switch on and see what happens. Any ideas/suggestions would be appreciated. I will post what happens after new switch and driving.
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Posted by: "Atwood,Warren" <Warren.Atwood@altramotion.com>
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