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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 01-18-2020, 09:59 AM   #1 (permalink)
darylt
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Not turning over

I didnt start my 03 for about 3 weeks and not it wont start. The wait light and IP lights flash. There sounds like a clunking noise, not a tick like the battery is dead. Had the block heater plugged in all night. Any suggestions would be appreciated.

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Old 01-18-2020, 10:06 AM   #2 (permalink)
OkDually
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Welcome,
First, start by removing your batteries and taking them to your local auto parts store and ask the staff to perform a load test on each one.
If one or both fail the test, replace them both as a matched set

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Old 01-18-2020, 10:20 AM   #3 (permalink)
darylt
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I'll check them, but they are both only 3 months old. My other Bosch batteries lasted 8 yrs.
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