Alternator question on 2001 Alpine
Got back from a long trip recently, started hearing a sound like crickets from engine compartment. Isolated sound coming from the alternator. took off the serpentine belt and turned pulley by hand and found slight resistance when turning. started engine and crickets gone. Alternator charges fine, so figured bearing starting to go bad. question I have is when I took alternator off, I found the red positive cable connected to the post marked negative. On the Alternator there is a sticker marked " modified for use with duvac system, negative ground only. see tech. service letter no. 45. I have ordered a new one from local NAPA store. Unsure what duvac system is and if this is why red cable hooked to neg terminal?
This coach is new to me, but we just put 3200 miles on it and no issues. charging was good, want to replace alternator but don't want to connect wrong. Looks like this alternator is original equipment for coach. Napa is going to ask about alternator , to make sure we get the same one that is modified for Duvac system. I was hoping someone can fill me in on what is going on with this hook-up. thanks Bob