Had a squeal on my ISL 400 in 07 Winnie Vectra. As you described, it squealed on acceleration. Thought for sure it had to be turbo. While on the road, and after paying a never used before freightliner dealer over $200 to tell me it was the alternator, I asked them if they pulled the belt to see. The answer was no. Tried to get my $200 back and essentially told to hit the road. Limped home and took to trusted freightliner dealer (Cruzans Freightliner in Bridgeton, NJ). Immediately, I was told that it was an exhaust manifold gasket leak. Replaced (under Cummin's warranty) and problem solved. Good luck.
By the way, tried to no avail to get freightliner to make the errant dealer account for my $200. I will forever be more inquisitive about a dealer's diagnostic approach.
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Rusty and Katy
11 Tour 42QD, 07 Chevy Silverado LTZ 4X4
Mickleton, NJ
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