4 ms·
Alternators don't have permanent magnets, they need current for the excitation winding. This is probably why they won't recharge a dead battery.
by RicoElectrico 5y ago
Alternators don't have permanent magnets, they need current for the excitation winding. This is probably why they won't recharge a dead battery.
- Nextgrid 5y agoIf there's enough juice to power a fuel pump, ignition coil, etc there should definitely be enough to excite the alternator. Old alternators' excitation terminal used to be powered through the "battery charge" indicator lamp so very little current would get through (and indeed the wire gauge was very thin).