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Old 03-20-2012, 07:12 PM
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starter problem

93 2500 hd turbo diesel...intermittently won't crank with key in start but will start when I cross the B terminal to the S terminal with a screwdriver. finally replaced the ignition switch but still has the same problem.

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Old 03-20-2012, 07:20 PM
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could be a problem with the neutral switch or clutch switch ,(stick or automatic), also there is probably a starter relay in the circuit, in the underhood fusebox, which could be the trouble.
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Old 03-20-2012, 07:31 PM
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Quote:
Originally Posted by latech
could be a problem with the neutral switch or clutch switch ,(stick or automatic), also there is probably a starter relay in the circuit, in the underhood fusebox, which could be the trouble.
automatic...neutral switch is a blocking plate near the key to keep the rod from pushing the switch...can't be that I think. no relay...purple wire gets it's juice from the switch to the S terminal on the solenoid. could be a weak or old purple wire... when I hooked up a volt meter to the S terminal and my son kept turning the key when we were stuck I got a wide variety of lowvoltage readings indicating a bad circuit. Must it be the ground through the solenoid or still maybe a bad switch? The screwdriver over-rides this problem by giving it a good battery terminal jolt to the S terminal I think. But on occasion I see a weak spark and it won't crank with the screwdriver either.
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Old 03-20-2012, 07:32 PM
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Quote:
Originally Posted by latech
could be a problem with the neutral switch or clutch switch ,(stick or automatic), also there is probably a starter relay in the circuit, in the underhood fusebox, which could be the trouble.
automatic...neutral switch is a blocking plate near the key to keep the rod from pushing the switch...can't be that I think. no relay...purple wire gets it's juice from the switch to the S terminal on the solenoid. could be a weak or old purple wire... when I hooked up a volt meter to the S terminal and my son kept turning the key when we were stuck I got a wide variety of low voltage readings indicating a bad circuit. Must it be the ground through the solenoid or still maybe a bad switch? The screwdriver over-rides this problem by giving it a good battery terminal jolt to the S terminal I think. But on occasion I see a weak spark and it won't crank with the screwdriver either.
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Old 03-20-2012, 08:07 PM
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Neal use this circuit. It's the same thing with the screwdriver method except the relay does it for you.
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Old 03-20-2012, 08:19 PM
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Make sure the battery cables are good and the connections to the battery are clean.
Remove cables, clean with a wire brush. Visual won't tell if it's clean.
If that doesn't work.
Replace hot and ground battery cables. They may look OK but can still be a poor connection on the lug to cable connection.
When cranking put a voltmeter on the battery connection at the starter to make sure your getting full voltage to the starter.

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Old 03-21-2012, 08:51 AM
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Quote:
Originally Posted by latech
could be a problem with the neutral switch or clutch switch ,(stick or automatic), also there is probably a starter relay in the circuit, in the underhood fusebox, which could be the trouble.
there is a fuseable link in the incoming red wire...hot one. I'm gonna scab a wire onto it...the battery positive to the ignition switch blue plug. And then I could do the same for the purple wire from the switch to the S terminal. Before I pull down the damn starter again. [I go through the fire wall deep to use the screwdriver mavbe I can get the solenoid off through there too.]and see if the problem goes away. If it does I'll look for where the weak part is and be more permanent.
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Old 03-21-2012, 03:07 PM
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I'd try running a temp jumper from the "S" terminal to the ing switch 1st...... if that solves your problem..... well you know what to do then.

Bypassing the fuseable link isn't a good Idea, you can cut out the link and replace it with a 70 amp maxi fuse....which will do the same thing,
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Old 03-22-2012, 07:29 PM
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Quote:
Originally Posted by nealpellecchia
93 2500 hd turbo diesel...intermittently won't crank with key in start but will start when I cross the B terminal to the S terminal with a screwdriver. finally replaced the ignition switch but still has the same problem.
It may be a problem with the security system.
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Old 03-22-2012, 08:19 PM
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I hooked up a volt meter to the S terminal and my son kept turning the key when we were stuck I got a wide variety of lowvoltage readings indicating a bad circuit.
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Old 03-22-2012, 08:31 PM
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Not sure what eve's trying to say?
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Old 03-22-2012, 09:07 PM
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Neal, This a common problem with older models. What you got is resistance from the battery to the S terminal. And the problem will get worst. By the time the voltage reach to the S terminal it has dropped at a point where the solenoid will not engage. Adding the relay as I suggest.
It will prevent any voltage drops because the contacts is connected between the battery post and the "S" terminal. The relay coil draws MA of current Vs a solenoid coil which it draws a huge amount of current.
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Old 03-23-2012, 04:34 AM
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If the purple wire is bad ....... adding a relay doesn't fix the wire. If the purple wire is good ....... adding a relay, just compounds the puzzle.
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Old 03-23-2012, 09:07 AM
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Another area you should check, make sure the grounding straps that run between valve cover bolt to the fire wall are properly grounded. There should be two of them.
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