1owner1990
Newbie
Hey all,
I've entered the 'systems check' stage of a nut & bolt restoration and upon keying the ignition switch to the 'run' position, a faint 'humming' can be heard from the alternator. The hum can really only be heard from a fairly close proximity and IS NOT accompanied by warm wires, odd smells or warmth on the alternator itself and it goes away when keyed 'off'. The alternator is a reman Delco (see photo). Googling 'humming GM alternator' got me nowhere, as half the posts say the vehicle is about to burst into flames, while the others say it's perfectly normal (some even point to reman Delcos being particularly notorious for humming for some reason?). Not clear which vehicles all the posts were referring to, and I really need a sanity check at this point. I'm hoping someone here would run out to the garage, key-on their 400 and put an ear about a foot from the alternator to see if there's a hum. In all the years I've owned this truck, I've never noticed a hum (nor have I had a reason to have the key on with the hood open). I look forward to your input, thank you for any help here.
I've entered the 'systems check' stage of a nut & bolt restoration and upon keying the ignition switch to the 'run' position, a faint 'humming' can be heard from the alternator. The hum can really only be heard from a fairly close proximity and IS NOT accompanied by warm wires, odd smells or warmth on the alternator itself and it goes away when keyed 'off'. The alternator is a reman Delco (see photo). Googling 'humming GM alternator' got me nowhere, as half the posts say the vehicle is about to burst into flames, while the others say it's perfectly normal (some even point to reman Delcos being particularly notorious for humming for some reason?). Not clear which vehicles all the posts were referring to, and I really need a sanity check at this point. I'm hoping someone here would run out to the garage, key-on their 400 and put an ear about a foot from the alternator to see if there's a hum. In all the years I've owned this truck, I've never noticed a hum (nor have I had a reason to have the key on with the hood open). I look forward to your input, thank you for any help here.
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