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  #81  
Old 08-02-2020, 12:35 AM
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Just on the off chance....

After so many times connecting to the OBD2 it is possible to crack the OBD2 block and not get connectivity to all modules and possibly ground out one or more wires giving you problems. (ask me how I know)

I found out only by accidentally wiggling the NT-510 cable in the plug because my DME wasn't showing. A trip to the boneyard and a long time under the dash fixed it.

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  #82  
Old Yesterday, 12:27 PM
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You need to test with more power. I fear your battery even when fully charged isn't supplying full voltage to the support modules and the starter.

Does it crank slower than normal and have you measured battery voltage during crank.

If you have a peak reading multimeter, measure the voltage from B+ under the hood to the positive in the cigarette lighter. Should be about 1 volt on a diesel (3/4 v on M54).

When a starter starts to fail it often just takes more and more current until the battery voltage sag is so bad you get abs or trans failure from low voltage.
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  #83  
Old Yesterday, 08:10 PM
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Thanks for all the feed back. I will invest in a new battery and see what comes of that.
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  #84  
Old Today, 01:14 AM
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Before you install new battery, charge up the current battery and get a current draw on the starter. If the starter is worn or can pull double the current, over 600A and it'll pull the battery voltage so low it won't matter how good the battery is
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