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Old 07-20-2019, 02:39 PM   #1
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National RV Owners Club
Spartan Chassis
Join Date: Mar 2011
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Generac 75D Starting Issue Resolved

Ever since I've owned this 2001 National Marlin (4 years), the Generac 7.5KW diesel generator has been hard to crank and occasionally would start. I had tried everything over several years including 3 starters and 2 solenoids. It turns out that by accident I discovered that the spacer for the starter motor was aluminum and was not permanently attached to the flange that held the motor. This spacer had oxidized to such an extent that the ground path from the starter was restricted and the starter drew excessive amps. It was a grounding issue but not where most everyone suspected. I thoroughly cleaned the spacer and flange, etc. and it cranks every time now. Am also using dielectric grease on all electric connections including the spacer.

I hope this will help someone who might have this setup. I cost me a lot of money and hours of effort.
John & Deanie, Corky and Benji (best buddies)
2001 National Marlin 390 DP
"Try to live up to your dog's opinion of you."
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Old 07-20-2019, 06:45 PM   #2
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Newmar Owners Club
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Wow great troubleshooting thanks.
2002 KSDP 3669/Freightliner XC CHASSIS/Cummins 5.9 ISB 300hp
Joplin, MO
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Old 07-21-2019, 07:17 AM   #3
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Spartan Chassis
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Originally Posted by Randy125 View Post
Wow great troubleshooting thanks.

I may use Ox-Gard on the aluminum flanges although it took 18 years for the oxidation to get this bad. If it wasn't so difficult to get the back mounting bolt in and out (starter motor), I definitely would put it on all the aluminum surfaces.

Thanks for the reply. I hope it helps someone else.
John & Deanie, Corky and Benji (best buddies)
2001 National Marlin 390 DP
"Try to live up to your dog's opinion of you."
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Old 07-21-2019, 07:33 AM   #4
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No need to remove the starter, run a short ground cable from a easy accessible starter bolt to the engine block or generator ground point.
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Old 05-10-2020, 05:52 PM   #5
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I need to replace the drive belt Idler pulley and both belts on my Quietpact 75D. Where do you guys get your parts?
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Old 05-13-2020, 10:28 AM   #6
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Location: Full Timing. When I park I'm home
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Good info. Thanks.
2004 Volvo, 2009 smart car
2008 Hitch Hiker Champagne
Full timing January 2010
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