it is inside the alternator. If the voltage regulator goes bad you have to change the whole alternatorAnswerIn your 1986 Honda prelude the voltage regulator should be separate from the Alternator. It should be a small black square with a five wire connector if i remember right. It should be mounted on the passenger side strut bubble inside the engine bay. Between the battery and the strut bubble and between the under hood fuse box and the engine. It is held on by two 10mm bolts. I know that this is where the voltage regulator is on my 1985 Honda prelude with the 1.8l carbed engine and since the 84-87 were mostly the same it should be the same on yours.
is inside the alternater
Most vehicle manufacturers now put the regulator inside the alternator.
just follow the positive line coming from the battery. The first component it meets should be the voltage regulator.
the voltage regulator is located in the voltage regulator compartment
the fuel rail
The 1986 Honda prelude 2.0 Si has a A20a3.
The voltage regulator/rectifier is mounted on the battery case.
In the alternater!
Inside the alternator
The voltage regulator for a 1991 Honda accord is mounted on the rear of the alternator. It is bolted on and can be replaced as a separate unit.