I have a 1990 mazda mpv that started haveing chassis elec. problems first with the cig. lighter not working. Now there is no interior lighting and the radio and clock have gone kaput. Replace light bulbs and checked all fuses. Do not have voltmeter. Haynes book says there is a CPU but must only be tested by a pro in a shop. Suggestions please.
Optional Information:
1990 Mazda mpv 4cyl
Already Tried:
rplacing bulbs, checking fuses.