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Wayne
Wayne, RV Mechanic
Category: RV
Satisfied Customers: 8441
Experience:  Work on several type of Rv engine, Trans, brakes
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, i Have Neptune 05 ISB300 Cummins won't Start I Check

Customer Question

Customer: ***** *****
JA: Thanks. Can you give me any more details about your issue?
Customer: i Have Neptune 05 ISB300 Cummins won't Start I Check Batteries Check OK it makes Clik but No Glow Plug
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Submitted: 11 months ago.
Category: RV
Expert:  Wayne replied 11 months ago.

Hi I'm Wayne

I see you been waiting awhile,

I will help you with this

This sounds to me 1 of 2 issues

1st, need a volt meter , check voltage at the starter battery terminal

your looking for 13.2 volt, and then again during cranking mode

should not drop below 11.9 volts , if stays the same, remove cables at starter and engine frame ground

clean and sand them , if after that , same isue

your neutral safety switch failed , but if you hear a click, then it is not that

I hope this Helped you

Hi if this helped you

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Wayne