240z Ammeter to Voltmeter

[HuD 91gt]

Hello,

After searching this topic it has come up many times in the past. Some links are dead, and some have given me some information regarding the voltmeter, but none about rewiring.

 

I have a highly modified 240z for which I’ve discovered the large 10gauge WR wire to be in beyond dangerous shape behind the dash (melted connectors, insulation cracking all over).  I have an upgraded 140amp GM alternator and a full EFI system with individual ignition coils, electric fans etc running from the battery. I’ve never run into these fuse able links which are described anywhere... perhaps the root of my problem.

I am looking to replace the WR wire completely, and install a later model voltmeter from a 280z (given to me from a local member).  In simplified terms, would I be running a heavy gauge (fused) wire from the alternator, to the starter (eventually to the battery) as well as a wire from the alternator into the cabin for the fuse panel (with a parallel wire running to the new gauge)?

Or have I somehow completely over simplified the system?

Any suggested on fuse ratings?

Edited September 12, 2020 by HuD 91gt

[Zed Head]

This might help.  It's from the 1971 Owners' Manual.  I think that you can bypass the 10 gauge wire way back before it heads up to the ammeter.  Not sure where exactly.  Maybe bu the fuse panel. The voltmeter will just need a small gauge wire to monitor voltage.  @SteveJ probably knows.

Edited September 12, 2020 by Zed Head

[HuD 91gt]

Thanks Zedhead. I finally found my manuals with electrical diagrams.

 

It looks to me I still need to run a fairly heavy gauge wire to the fuse panel.  But other then a small wire to the gauge, and a “fused” wire to the alternator I do think I’m good.