Twenty years ago I maintained a small fleet of ambulances for our city of 7000 people. One thing that I noticed was the belt tension and belt life on a single 200 amp Leese-Neville alternator. I had to replace the single 1/2" drive belt with an OEM belt every other oil change to have a reliable ambulance.
You only loose one belt on an ambulance before you step up your game!
The situation got much better when the manufacturer went to twin 125 amp alternators with a 6 rib belt.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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