When I measured 36 volts coming off altenator trucks was at idle speed and battery was still connected normal and I used a volt meter with one lead to frame ground and other lead to the altenator post where hot wire connects to alternator. When I measured 10 volts between frame ground and negative battery post truck was turned off. I left positive cable still connected to battery and disconnected frame ground from battery . I got a volt meter connected one lead to negative post of battery and one lead to frame ground and measured 10 volts. Is all this normal ?