regarding the S5 TII alternator, is it the same as the S4 or S5 all motor (n/a) alternator??? great write up btw, mar3

thanks in advance,

-Ray-

 

The NA alternators are anywhere from 50 to 65 amp output models...that's why you're looking for a TII car...if someone is advertising or listing an S4 or S5 alternator, always make sure it's an 80 amp model before bidding or buying one. The metal tag on the alternator will have its amp rating clearly on it.

 

I gots me a 91 turbo alternator...


....The stock ring up top was too small for the bolt it attaches too, so I just cut it, bent it out, and fastened it tight under the nut.

The plastic harness is different, so it was busted open, and the 2 wires with spade connectors slip right on. Works great.

 

i would go for dankus's buik alternator conversion
130 watts wasnt it?"

 

Last week I upgraded my 74 REPU 50 amp generator and external regulator to a S4 88 Rx7 n/a 70 amp alternator with built in regulator.

Bolted right up. Used four thick washers instead of spacer. REPU spacer won't fit, too long. Biggest trick was wiring up the exciter wire. Take the six pin external regulator connector. The one that's wired into the harness. Flip it up so it's connectors are looking up at you. Bottom rightmost wire gets wired into the alternator. It gets +12 volts with ignition switch ON or START.

On the alternator, where the the two wire pigtail goes: Wire it into the top, horizontal connector on the alternator. I am not using the lower vertical connector at all.

The Generator dash idiot light works correctly too. With motor off and ignition switch to ON, G light is on. With motor running G light is off!

And I got rid of that ugly external regulator.

14.38 volts @ alternator. 14.36 volts @ battery + terminal!!!!!!!!!! Only .02 volt drop thru the 11 foot REPU + alt cable! I replaced the stock 10 gauge alt wire with thickly sleeved 6 gauge.

There's not much electrical components on the old school rotaries so 70 amps will be PLEANTY. At most I'll add a 100 watt stereo or some nice 80 watt headlights.

Plus the S4 88 n/a 70 amp alternator was in stock for $106.00. The S5 90 T][ 80 amp alternator was in Indiana for $168.

 

less than 50$? Dude, I've gotta do this. And don't worry about your engine bay, it's cleaner than mine is, and I *have* been cleaning it!

Jon

 

junkyards here in socal are packed with MX-6, 2nd gens, and other mazda that have same alternators. $15 with 30 days warranty. In my experience with imports, I will only get the green coil pack. other colors are bought from autozone pep-boys etc which are known for failure. yes, they come with lifetime warranty but how many times would you need to change it.

 

And it only costs $40 total, right? Remember the name of the thread...economical...and if you do junkyard shopping, read the metal tag! All 2ndgen alternators are not the same! Caveat Emptor...

 

Just checked the alternator that came on my jspec t2 motor and it says 70 Amp?

 

where are the local junk yards that sell rx7 parts??

 

there are 2 walk in junkyards in sun valley (u-pick u-pull OR pick-up part). located 5 Fwy and tuxford exit.

there are other locations too and it depends if your willing to drive up there. im heading tomorrow or saturday morning. send me pm if your interested.

 

lol....listen to what I'm saying...there are minor differences in all the alternators offered in the RX-7s....calling it TII is convenient, but calling it the 80 amp model is specific and the '89 -'91 S5 alternator will say it right on the tag....you have to look or be told specifically it is an 80 amp model to know you got the right one...assume nothing...except that the conversion work I've laid out for y'all is correct...

 

i just put an fd alt in my 84 gsl-se and it went in without much problem. had to grind some clearance on the v pulley that i robbed from a mototech alt my neighbor had laying around in his barn.
otherwise hookup and install went flawlessly

 

when i wired up my fd alt in my 84 i just used the hot wire i had left over from my air pump removal for the extra 12 volt wire the alt needs.
when the car is turned on the alt gets the extra 12v it needs otherwise not. maybe this hookup will cure the batt drain prob.
give me a few days and i will let you know if all is still well.

 

anybody have the link for the silicone vaccumn tubing for the great price?
i know it was in one of these alt threads but it is like a needle in a haystack to me right now
thanks

 

http://www.hightempsilicone.com

 

thanks

 

So what difference did you see with the alternator change??

 

actually not much running wise other than my alt/amp gauge always reads at a higher level and never goes below half now at idle.
i am running about 800 watts of amps, a black magic electric fan and the electric 6 port mod on the system so far.
with the cost of the used off ebay 100amp alt and any other expenses(wire/terminals), i have under 60.00 in this mod.
not bad i think

 

my next mod will be one of those 7 point engine ground setups i see mazdaspeed sells.
they say it will improve performance.
i will keep everyone posted