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Old 01-14-2015, 10:23 PM   #1
KEH
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Generator no crank problem - Generac Quietpac 75D

When starting up the generator the starter dragged (as usual) and then it fired up and ran about five seconds then quit. So tried again and now nothing - no preheat clicking and not starter response at all. Batteries are all up and good. I started coach engine with no problem and I'm on shore power.

I've checked for blown fuses and see none. I checked voltage at the battery cable terminals underneath the coach on the rear of the generator chassis and have 12.44v. I'm thinking it's a starter problem, but wonder why the preheat light doesn't come on though. I've tried starting from both the inside coach switches as well as at the generator.

Any help would be appreciated!

Thanks,
Ken
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Old 01-15-2015, 08:59 AM   #2
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Check the voltage at the starter connection while pressing the start button. If it's less than 9 volts, then you have a resistive connection in the 12 volt lead or to ground somewhere, or both! Defective (resistive) grounds are notorious for causing start problems. Thoroughly clean and reconnect ALL grounds to chassis, starting at the battery bank. Rook
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Old 01-15-2015, 12:40 PM   #3
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If you have the manual see if there is a fuse in the control circuit. You can download thd manual pages here.
http://www.manualslib.com/manual/634...?page=9#manual

In section 2.1 it shows there is a 14 amp fuse for the DC circuit.
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Old 01-15-2015, 12:51 PM   #4
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Addendum to post #2. If you have 12.5VDC at the starter terminal while pushing the start button, then you have an open (bad) starter motor, or.......a bad ground to the ginny frame. If no voltage at the starter connection, then there is a bad relay, open wire or high resistive connection between there and the battery bank 12VDC terminal. Rook
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Old 01-15-2015, 10:17 PM   #5
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Thanks much for the advice and reference info!

Checked the 14 amp fuse at the generator and it is good.

Rook - I will have to check the starter resistance and ground this weekend and I'll report back.
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Old 01-19-2015, 12:52 PM   #6
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Ok checked the voltage at the gen battery leads with switch in the crank position and shows 1.8v. Going to look for ground connections to the chassis and start removing and cleaning them.
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Old 01-30-2015, 10:33 AM   #7
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Just following up with the resolution to my gen no crank problem. I had the coach serviced in Gaffney, SC earlier this week and they found the problem. On the back of this circuit board there is a breaker that was tripped. I would have never thought to look behind a circuit board for a breaker. It has a small leg under a rubber boot that needs to be pushed back up when it is tripped.
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Old 01-30-2015, 01:59 PM   #8
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Where was the circuit board located,?
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Old 01-30-2015, 10:24 PM   #9
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Thank for the update. That breaker is also for your jacks. Attached is the schematic for the RV Custom Products 12V distribution board that shows the location of the breaker. Not sure if the other drawings apply to your coach. You can call RV Customs products to get the troubleshooting guide for your board.
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Old 01-31-2015, 11:46 AM   #10
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Quote:
Originally Posted by scampers227 View Post
Where was the circuit board located,?
Located in the right rear compartment where the inverter is.
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Old 01-31-2015, 11:53 AM   #11
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Quote:
Originally Posted by chboone View Post
Thank for the update. That breaker is also for your jacks. Attached is the schematic for the RV Custom Products 12V distribution board that shows the location of the breaker. Not sure if the other drawings apply to your coach. You can call RV Customs products to get the troubleshooting guide for your board.
Thanks very much for that! I have saved for future reference. I've been saving all related motorhome documents as possible in electronic format to my laptop. I will burn them to a DVD, which will go with the coach if I were to ever sell.
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