someone82

As the title states: How do you convert to a internally regulated altarnator on a 79 with a externally regulated alt?

matt

rogan

iTrader: (7)

Step one, spell alternator correctly.
Step two, goto
http://www.nellump.net/peri/epi/firs...orUpgrade.html

someone82

thanks

someone82

Well Rubin's instuctions are very brief about the wiring the *alternator... so if any one has done this before if they could paint a better picture for me.

matt

rogan

iTrader: (7)

This is a better explaination by Rubin.

Upgrading '79/'80 alternator to '81+


The reason I replaced my alternator with a newer one was because the
external regulator/relay was fried. I couldn't find a replacement
so I put in a newer internally-regulated alternator ('81 or newer).
This forced me to remove the external regulator and replace it with
just a standard automotive relay in order to properly operate the dashboard
light/meter and the choke heater).


The battery terminal (thick black wire with ring-terminal) is the
same for old/new alternators.


The following diagram is the connector on the back the new alternator
(2 terminal) which is different from the old one (4 terminal). At
this point I'm not going to say which wires in the harness can/should
be reused, it complicates the description. For now, just run two
new wires to make sure it works first.


___TAB___
| |
| --- | <--------- Ig
|__ __|
| |
| | | <--------- Re
|___|


The Ig wire should be your own connection to to a 12V source when the
key is ON ignition.
The Re wire should be connected to the relay below.


The relay should be wired as follows:

YL Y Re
| | |
| | (
N/O / N/C ! ) COIL
| | (
| | )
Ground Ground |
12V ignition source


(N/O is normally open, N/C is normally closed)


The following wires are found on the vehicle side of the connector
when the regulator is disconnected and removed (it's good space to put your
new relay):
YL: Yellow/Light Blue stripe (on the big connector) (goes to dashboard)
Y: Yellow (on it's own connector) (goes to choke relay)


Make your own connection:
Re: Connect to Re terminal at alternator.


Theory: Assume ignition is switched on.
When engine is not running OR alternator is bad, there will be 0V at the
Re terminal causing the relay to energize. The relay will:
- - YL to ground (causing the dahsboard light/meter to activate)
- - Y to open circuit (disabling the choke heater relay)


When the engine is running AND the alternator is good, there will be 12V
at the Re terminal, the relay will not energize. The relay will:
- - YL to open circuit (dashboard will be normal)
- - Y to ground (enabling the choke heater relay)


***
Disclaimer... I'm not responsible for anything that happens by following
these directions. Any connections should be double checked in the Haynes
manual and/or tested with a meter.

someone82

Thanks alot, I appreciate that version, it's much more clear.

Matt

Ozmodiar-X

Ok, i need help with this. That txt diagram does not help me at all. this is the relay i got. only one the stores had. sorry for the bad picture of the box but can someone please help me out.

Siraniko

iTrader: (13)

You dont need that crap. Install the 81-88 alternator. Find a 12V source when the key is on. Connect a wire from this point to the back of alternator as shown in the following picture. There is another way but I need a couple more heine's. My memory is bad without it.

Ozmodiar-X

...and what about the dash light?

Ozmodiar-X

no one done the relay thing?

dbragg

iTrader: (7)

wacky--thats all you have to do to install a 81-88 alt in a SA? what about a 89+? splice the wire into the S5/S6 connector and do it just like above?

Siraniko

iTrader: (13)

Remove the relay and place two jumper wires. I just cant remember which one since it has been several years plus since I cleaned up my garage, I cant find ****.

Siraniko

iTrader: (13)

LMK take pics so its easier to follow

Siraniko

iTrader: (13)

S5 alternator
For 81-85, the other wire goes to the 2-wire pigtail for stock gauges etc etc. For pre-81, disregard OR connect to an aftermarket volt-meter.

Jeff20B

iTrader: (13)

I've never used a relay on the REPUs or other old school Mazdas I've done. That Rubin guy, lol.

dbragg

iTrader: (7)

wacky--if im not mistaken wont running that one wire straight to the other post make the alt drain the battery if the car is left off for an extended amount of time. i think that makes it pull power constantly. i could easily be wrong though.

Siraniko

iTrader: (13)

Thats 100% correct but some says it has minimal voltage loss. If you're worried about power loss, I highly recommend using a fog lights relay to open the circuit when parked. Just connect 85 or 86 terminal to an ignition wire to trigger the relay.