Bad diode causes a ripple issue, you can check this with a meter. Alternator will charge fine, but basically the diode is allowing a draw to happen because it’s allowing the voltage to flow the opposite direction when off. Wouldn’t recommend driving it with a bad alternator as who knows what it could do next, but theoretically he could. If you’d like to verify with a meter if it is a bad diode there’s some videos out there explaining this. Also those alternators are not super fun to replace.
Bad diode causes a ripple issue, you can check this with a meter. Alternator will charge fine, but basically the diode is allowing a draw to happen because it’s allowing the voltage to flow the opposite direction when off. Wouldn’t recommend driving it with a bad alternator as who knows what it could do next, but theoretically he could. If you’d like to verify with a meter if it is a bad diode there’s some videos out there explaining this. Also those alternators are not super fun to replace.