Frank McElroy Posted November 7, 2020 Share Posted November 7, 2020 Since purchasing my coach new in 2007, I always thought my coach ISL engine cranked slower than I expected using the starter batteries. I chaulked it up to that's the way it is until a while back I noticed other ISL engines cranked over much faster than mine. Well, I found the problem. Actually two problems. First, I upgraded the small chassis battery cables connecting the two chassis batteries from 2/0 to 4/0 cables. One was getting hot, because of a poor crimp so I made two 4/0 cables. The other issue was at the starter ground lug. On mine, access is extremely limited because of an engine hydraulic pump bracket. A standard box wrench won't fit. To solve this problem, I used a thin wall 3/4" deep well impact socket with a 3/8 to 1/2" drive adapter. I found 4 wires connected to that starter ground lug. Two 4/0 cables (one from battery ground and the other to the chassis frame rail) and 2 smaller lugs going to starter related relays. One of those small lugs got caught in the stud threads next to the nut preventing a tight ground cable connection to the starter. So, I repositioned both small lugs against the starter first, then the two 4/0 ground cables, then a lock washer (Monaco didn't use a lock washer) then the nut. Pictures are worth a thousand words. Hopefully this might help someone who has a similar problem. Oh, and yes, now the engine starter spins like a top - faster than it ever did when new! 1 1 Link to comment Share on other sites More sharing options...
John Haggard Posted November 7, 2020 Share Posted November 7, 2020 Great and critical information Frank. Thank you for sharing. Link to comment Share on other sites More sharing options...
Paul J A Posted November 7, 2020 Share Posted November 7, 2020 Monaco used the wrong sized cable from the battery to the starter on my 07 ISX 525. It was always hard starting. I had the cables replaced with heavier ones and that took care of the hard starting. A friend of mine did the same thing to his 2006 ISX 600. Link to comment Share on other sites More sharing options...
John Haggard Posted November 7, 2020 Share Posted November 7, 2020 Those lighter cables burned out many a starter. Link to comment Share on other sites More sharing options...
Brett63 Posted December 17, 2020 Share Posted December 17, 2020 I have the slowest cranking engine I have ever seen. I have the 650 Cummins Link to comment Share on other sites More sharing options...
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