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  #1  
Old 01-09-2005, 06:06 PM
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no start 83 300cd

After my brother rode in my 83 300sd he fell in love. He now has a 83 300cd, We had a motor put in and it started fine,We then replaced the oil cooler and both hoses.Now it won't start. The car has been outside for 3 years with the blown motor. As I said all was well before the oil cooler work.We have no idiot lites but the fan, radio, horn all work. I did a complete fuse box survice with all new fuses, I cleaned all connections and tightened all connections on the starter. The car will start if I connect the purple wire at the juntion box on the right inner fender to the poss. battery terminal.I just don't know, am I missing something? ingnition switch? I tryed a used switch and the glow plug relay clickes but no start. Any suggestions? 5 hours today and I'm still frozen after coming in an hour ago. steve 83sd

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Old 01-09-2005, 06:44 PM
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steve think you need to get the car in a controlled environment.. ie. thaw it out! sounds like you are on the right track with the key switch but if the glow plug relay is bad there's a good chance the car would not start outside in this nonsense weather we have right now. plus all the condensation and water around can't help any for those electrical connections.
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Old 01-09-2005, 08:26 PM
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84 300dt, thanx for the suggestion on the wet and cold, didn't think of that myself duhhhhhh. Could it be that simple? hope so. steve 83sd
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Old 01-09-2005, 08:34 PM
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well only because you said it was outside for 3 years.. if the wires are all wet with condensation inside maybe a good drying out/warming will help.
do you think all the glow plugs are working?
did you put the old key switch back in? it seems something is not making contact between the key switch and the junction box on the fender well.
grounds all good?
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Old 01-09-2005, 09:23 PM
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I would check to see if the glow system is functional by using a test light at the glow plugs. See if you have current during the glow cycle.

You can test each glow plug individially by removing the wiring harness and hooking a common test light with the ground clamp on the positive battery terminal.

When you touch the probe to the threaded stem on each glow plug, the light should illuminate. If it doesn't, you have a faulty glow plug and it should be replaced.

I haven't checked my wiring diagram, but it sounds as if your glow realy is not getting power.

Remove the 'strap fuse' (usually a 60 or 80 amp metal strip) housed in a junction box on the fenderwell.

I have seem them with a hairline fracture that cannot be seen until it is removed.

I know these are basic ideas, but I hope they are helpful...Bert
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Old 01-09-2005, 11:50 PM
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Is the starter turning the engine over? What exactly happens when you turn the key?
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Old 01-10-2005, 08:07 AM
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I took the back of the switch apart so as to replace the part the wires plug into. I switched that to a different, used one. So with it in hand I turn it with a srew driver. The only sound is the glow plug relay clicking with no response to the starter position. As I said before the car starts and runs when I jump the purple wire at the juntion box on the rt inner fender wall. I just get no response from switch. Does the switch have to be together for ground? What am I missing, this seems so simple. I guess the second used part could be bad also, but the turning action feel good. I guess i'll get another one and try that. steve
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Old 01-10-2005, 08:48 AM
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If the car isn't in park or you knocked the shifter arm off at the firewall or knocked the electrical harness off the side of the tranny , the starter won't crank. HTH MIke
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Old 01-10-2005, 03:09 PM
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It is probably a mistake to start arbitrarily changing things without testing. You may cause more problems than you fix.

If you can't get the starter to turn when you apply 12V to the correct circuit at the starter switch then there is no way that the starter switch is to blame. Right?

You have a beginning point with the purple wire. Find the next place that you can access that circuit and test to see if the starter turns when you put 12V to it.

I probably can't help you because I can't understand your writing. I can't tell when you did what or why. Try to write sequentially so that A leads to B leads to C. Part of this problem may be a high fluster factor.
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Old 01-10-2005, 03:48 PM
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hmm, yes, i also see where there may be a problem with the neutral safety switch as westkill suggested. would that account for not being able to crank with the key switch but being able to crank from the purple wire?
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Old 01-10-2005, 05:06 PM
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yes because you are bypassing the neutral switch. Check the plug on the left side of the tranny near the modulator. HTH MIke
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  #12  
Old 01-11-2005, 08:10 AM
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thanks guys, I'll check neutral safty switch this weekend. steve 83sd
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  #13  
Old 01-15-2005, 08:24 PM
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westkill, you were correct, the nuetral safety switch was loose, when I tighten it up and pressed the harness back on the starter cranked just fine. The lights on the cluster also came on when I pulled the cluster and removed the harness, cleaned both[ meanie greenies] and replaced. The car now runs great. Again, thanks to all who made suggestions, as I could not do so of these things without all the help here. Again. thank you all steve 83sd

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