1990 mpv wiring diagram/alternator proble

I need a wiring diagram for 1990 mazda mpv and also have problems with the alternator sometimes it charges and other times it does not. Can someone help me thanks

I was wondering if the alternator would be the problem or if there is a switch or relay that shuts it off. Usually when i first start the car it charges then 10 to 15 mins later it shuts off and the charge and rear light warning lights turn on. The tail lights are good so dont know why the warning light turns on. There is a hold light that flashes all the time, dont know whats it for. Any help would be greatly appreciated.  Thanks

where do the two wires from the voltage regulator on the alternator go to , i loose them in the bundle of wires in the tightest spot to see or work in ever?