I'm working on upgrading electrical system.

My car is '75 280z.

My goal is :

• Replace Alternator to CS144 with removing external voltage regulator.
  
• Remove Shunt.
  
• Add extra fuse with install Maxi-fuse box. (75 has only 2 fusible link)
  
• Add ignition relay (75 does not have it)
  
• Swap Ammeter and Voltmeter
  

My '75 280z has only 5 wire for external voltage regulator.

When I googled, several people encounter issue for the missing #1 wire, which is green/red colored.

Blues web site is always helpful. There is answer for this.

HELP 75 Alternator swap

I just create illustration for this solution.

I will keep update the progress.

Edited October 31, 201410 yr by tamo3

You can grab CS144 alternator from Cadillac DeVille. Try to find 92-94 in the junkyard.

The hardest part is to remove pulley. There is taper collar that prevent from removing the pulley.

CS144 pulley removal - tapered collar type - International Full Size Jeep Association

I could not remove the the taper collar, so I grinded to remove the pulley.

Just follow instruction video to rebuild alternator.

Part 1

Part 2

Paint the cover too.

completed.

Hi Tamo,

Nice mod and good clear instruction. Looking forward to seeing finished/installed pics.

Do you have the specs for the CS144?

Cheers Chas

Hi Chas,

Long time :-)

CS144 bring up 140Amp.

Alternator Theory v15

Reference from Hybrid Z:

AC Delco/GM Alternator Swap Part 2 - CS144 Installation - Ignition and Electrical - HybridZ

Shunt!

I searched on web, but I could not find any good information about '75 280z shunt.

I learn some earlier model has shunt inside of the car (maybe 240z, 260z?) later model is in the engine bay.

This is the shunt!

Voltmeter, Ammeter wiring comparison

75 Ammeter

76 Voltmeter

77 Voltmeter

78 Voltmeter

ammeter

voltmeter

connection comparison

interesting post - but i'm still a little fuzzy on why the switch to this particular CS144 model.

the "performance curves" graph seems to start at about 1,200 rpm, and i don't know what the pulley ratio is in relation to the crankshaft, so i'm not sure if this alternator kicks in sooner or provides an overall greater output or what...

interested in finding out though!

I haven't measure and calculate the ratio. 

I will do it later.

 

Got the donor connector from '76 280z. 

 

Add diode.

 

This dongle is for '75 280z with 5 wires. Can't use this for other year model.

Hi Tamo,

 

Do you have any photo's of the pulley? Nice photo's on removing the old one. Just wondering how the 280Z pulley fits or do you use another pulley all together.

 

Great photo's. Makes the modification clear and easy to follow. It will be intersting to see how this unit performs.

Chas

Here is the photo.

 

This is original Alternator.

V-pulley consists of 2 pieces.

 

The hole diameter is same. I can just mount it to CS144.

 

Mount the V-Pulley onto CS144.

Working on Voltmeter re-wiring.

 

I follow the direction from zcar.com post.

http://www.zcar.com/forum/10-70-83-tech-discussion-forum/81242-amp-voltmeter-conversion.html#/forumsite/20721/topics/81242

 

No need to modify the big connector 

 

Smaller connecter need to rewire.

- Black with red tag is measuring Voltage.

- Black connect to black wire in the big connector. This is ground earth.

- Green/white is connect to same as Ammeter.

 

I need to find where I should merge this Voltage line near the fuse box....

 

Installed and run the wire.

 

Anyone direct me where should I connect the voltage measurement wire?

 

Thanks,

tamo3