Voltage Gauge in the YELLOW

M1123- while driving, my Tachometer went dead, then looked down at voltage gauge and it went from green to in the yellow. Any advice where to start to find out what part is bad?
All connections are clean and tight.

file:///C:/Users/musta/OneDrive/Documents/humvee/niehoff-alternators-troublshooting-TG17_uid252021123202.pdf



C.E. Niehoff & Co.
N1225 / N1237 / N1505 Alternators
Troubleshooting Guide

Tang8u said:

file:///C:/Users/musta/OneDrive/Documents/humvee/niehoff-alternators-troublshooting-TG17_uid252021123202.pdf



C.E. Niehoff & Co.
N1225 / N1237 / N1505 Alternators
Troubleshooting Guide

Click to expand...

Tang… You posted a link to a file on your personal computer that cannot be opened by anyone but you.

Tang8u Was trying to send you the file from Neihoff regarding alternator and regulator checks. Before before you go through that checklist, I would pull up every one of the rubber grommets and make sure that every connection is tight. I have seen them come free, including on my rig. Check and clean all battery connections too (you implied you did that).

Also, unlikely but still ensure both PCB/EESS plugs are on tight.

[EDIT- RWH’s post directly below mine is probably the best diagnosis. Failed regulator]

69Roadrunner said:

M1123- while driving, my Tachometer went dead, then looked down at voltage gauge and it went from green to in the yellow. Any advice where to start to find out what part is bad?
All connections are clean and tight.

Click to expand...

Tachometer is fed from the regulator, most likely the regulator is or has failed.

Troubleshooting guide

Mogman said:

Troubleshooting guide

Click to expand...

Thank you!!!