ok well
i have a 88 vert
stock aside from a electric fan and a ford Taurus alternator.
oh and i relocated the battery behind the driver seat cubby.
now i have put 3 new batteries in. but i have the same issue.
first one was a parasitic loss which ill fix soon.
but my thing is that i jump start the car leave it running for a good 30 mins
and then turn off the car and immediatly try to turn it back on and
i have a dead battery again.
i thought it was the alternator but it cant be because the car stays on even when you rump on it. the alternator alone couldnt power the whole car.

please help me
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You have wired up the alternator incorrectly, and it is not charging the battery while the car is running. And yes, the alterntor powers the whole car when it is running.

 

so that must be why my voltage goes up and down with engine speed....
hmmm
can you point me in the right directions i got a 3 wire alternator and two plugs on the fc harness
ive search but only find the tempo 2 wire set up

 

https://www.rx7club.com/showthread.p...lternator+swap

 

^^ That details a swap on a series 5, i didnt read through the whole thread and maybe it will give specs on a s4 swap, but check the FAQ's about a s5 to s4 alt. swap

 

you kno what now that i look at it again it makes sense now
its always the simple **** that gets you.
i looked at that thread billions of times