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With a volt meter. Just check for +5 Vdc on the output side of it.
It is a regulator, changes the input 12V to 5V for the cluster. When it goes bad,
all your gauges will give erroneous readings except the fuel gauge; and ampmeter
if equipped.
It puts out a constant 4.98 volts DC all the way up to a 1 amp load.
Put an inline fuse (2 amps) in the circuit in case there is a short.
A new unit will be like $26.00+ on-line. That diagram is in case you want to build your own
and put it inside the shell of the old one. Heat shrink tube all the leads...Voltage Regulator Circuit; 12V to 5V for older mustang gauge clusters.
The fuel gauge runs off the voltage regulator along with the oil pressure gauge and the temperature gauge. Unfortunately the wires are all Blk-Green. Make sure it is connected correctly. The Wire from the big connector under the dash (12V positive) is by itself. There are two wires on the other side.
03-09-2018, 01:09 PM
