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Randall, RVIA Certification
Category: RV
Satisfied Customers: 10978
Experience:  RVDA/RVIA Master Certified Technician with many years experience.
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Motor cranks run then stops when you let go of switch

Customer Question

Customer: ***** ***** motor cranks run then stops when you let go of switch
JA: Thanks. Can you give me any more details about your issue?
Customer: no power to coil unless cranking hot wire coil it will stay running
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Customer: yes
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Submitted: 1 year ago.
Category: RV
Expert:  Randall replied 1 year ago.

Is this on a genset? If so, what is the complete model number?

Customer: replied 1 year ago.
4.0bge-1r/26100a model# c850 753456 serial#
Expert:  Randall replied 1 year ago.

That is almost almost always a problem with the ignition/control board. It is a very common problem. I would use an after market board made by Dinosaur Electronics as they are more reliable than the OEM boards and have an outstanding warranty. Or you might try Flight Systems as they make good quality boards and controllers for these as well. Hope that proves helpful here. Please get back to me if you feel the need for more discussion relating to this issue as all follow ups are included in our fee.

Customer: replied 1 year ago.
new board did not change anything
Expert:  Randall replied 1 year ago.

Did you check the oil level? If it is good, then check the oil pressure switch. It that is bad it won't run either.

Expert:  Randall replied 1 year ago.

Just checking back in to see if you were able to resolve this or do we need to dig deeper?