will an alt off a 86 work on a 90?

 

yes

 

You will probably have to rewire it.

 

if you do have to rewire it is there like a diagram or anything?

 

.

The R terminal on a series four is a Switched source of batt voltage. Switched by the key.

The S terminal on a series five is a constant, 24hrs a day, source of batt power.

To me, you'd need to NOT use the present S terminal wire of the series five on the series four alternators R terminal, but run a SWITCHED source of pwr to the series four R terminal.

But hey, go use the present S terminals wire on the series four and let us know how things turned out.

 

what about the coil packs would they work?

 

If you are going to switch between series and rewire, why not just get an FD alt?

 

not sure if im going to or not just seeing if it would work. i might be getting a parts car im just trying to see if all the parts i need off of it will work.

 

Coil assy's work b/t series. Same ole items.

 

the s4 alternator doesnt charge as much amperage as a s5 alt. So you will be degrading if u put a s4 alt on

 

ok sweet thanks