Gaffrig gauge Electrical question

[boomer35]

On the back of the gauges is the terminals to screw the wires from the dash in....... most gauges have 4 terminals, 2 are labeled (I), one is labeled (G) and one (S)

other than G being ground most likely, can anyone explain the system

 

[MOBILEMERCMAN]

On the back of the gauges is the terminals to screw the wires from the dash in....... most gauges have 4 terminals, 2 are labeled (I), one is labeled (G) and one (S)

other than G being ground most likely, can anyone explain the system

I is ignition S is sender G is ground

You can usually separate the light from ignition. Volt meter has no sender.

The gauge needs power and a ground for basic function. Most senders adjust ground to move the gauge. You can test the wiring to a gauge by grounding the sender. Most gauges this will peg the gauge to the right a few may peg to the left. The tach is different do not ground its sender lead

 

[Master Wrench]

(I) is for Ignition,Purple (G) is for ground, Black and (S) is for the sender wire what ever you are reading.

 

[boomer35]

great info, cant wait to get to her tomorrow now and hook it up, much more confident now!

 

[MOBILEMERCMAN]

(I) is for Ignition,Purple (G) is for ground, Black and (S) is for the sender wire what ever you are reading.

Basic color codes

Grey = tach
Tan = temp
blue = oil press
brn/white = trim or oil temp
tan/blue = alarm
yellow/red= start
orange = accessory
pink=fuel

 

[Ratickle]

Basic color codes


pink=fuel

Ever wonder why pink is fuel? You know there was a reason behind it in the beginning. Was Brownie at Merc then?:sifone:

 

[boomer35]

on the volt gauge, can you attach both the wires to the sender or ignition? or will the volt gauge have your typical 4 terminals coming out the back

also, if the terminals coming out the back where the wires slide on or and the nut tightens onto is broken short, is it possible to take the old terminal out and replace it with a newer longer one?