under the hood
On a 1991 Miata, the battery is in the trunk. It is probably the same on the 1990.
were is a ALTERNATOR
It is towards the bottom on the passenger (right) side of the vehicle.
It is inside the alternator.
92 mazda miata not pulsation in the injectors
It's located behind the alternator, you can easily be removed if you temporary take out the alternator.
Near the battery or on the back of the alternator
either too tight or to loose, need about 8mm of give between alternator and drive pulley
it doesn't have one the alternator is regulated in side
The alternator has a built in voltage regulator.
Inside the alternator.
There is no Distributor cap or rotor in a 91 Mazda Miata. All years of the Miata use electronic computer controlled ignition systems.