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Old 08-17-2015, 08:17 AM   #21
Join Date: Aug 2011
Posts: 22
We had a 21 kw Onan that had a similar problem. The wire run from the start battery was too long for the wire size. Moved the battery close to the starter and it start instantly every time.

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Old 08-17-2015, 04:59 PM   #22
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City: Coastal SC
Country: USA
Vessel Model: Viking 65 CP MY (run at trawler speeds !)
Join Date: Jul 2015
Posts: 373
FWIW, today I started the generators without using preheat and they started exactly the same as with preheat.

So either preheat doesn't help when the generator room is 85 degrees or I have glow plug problems.

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