I have a 98 chevy 1500, has a 105 amp alternator that is not doing the job now, I had it tested at different auto parts stores all say its not working. I have a snow plow mounted and only do a few driveways but push the switch to operate the plow and it uses a lot of power and that's typical it really never has worked well for the plow and I wonder if that has hod something to do with wearing out the alt . I added a second battery a couple years ago and doesn't seem to help much, I'm wondering if I can step up to a new alt with a higher output like say 130-140 amps if that would help and can I do that without changing other equipment on my truck? each parts store tells me a different story and I don't know who to believe? Any help I can get on this matter would be appreciated. Thanks.
S N