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Old 07-30-2015, 11:14 PM   #1 (permalink)
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Default 1991 Fuel/Temp gauge issues

Hello,

I'm a Tracker guy but trying to help on a friend's Samurai...

06/1990 Samurai was originally a Fuel Injected Truck. A friend has bought it as a Weber Carbed Truck. ECM is not in Vehicle. Issue is no 7 volt signal for Fuel and Temp Guage. On Printed Circuit on back of Cluster points are marked as Ign + but have no Power. Points marked as 7V also no has no power. Wiring in
Plugs with wires showing 12V when traced through printed Circuit do not supply power to points mentioned.

Does the ECM supply the low voltage for the gauges ?

Should I be finding 12V at points marked Ign. + ? (2nd pic Red Arrows)

I can't find a Wiring Diagram for this Instrument Cluster and it's different from
all the others my friend has in his Parts Collection.

Any ideas ? ? ?
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1991 Fuel/Temp gauge issues-samurai-022-copy.jpg   1991 Fuel/Temp gauge issues-samurai-018-copy.jpg  
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Old 07-31-2015, 04:26 AM   #2 (permalink)
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The ECM does not power or control the gauges. The 7V comes from a regulator on the gauges, if you have no 12V then you will not have any 7V. It sounds like it could be a fuse/fuse box problem.
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Old 07-31-2015, 03:14 PM   #3 (permalink)
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Thanks for the reply.

I have checked the fuses with a test light. All test OK but it could be an
issue between the fuse box and the Dash. Cleaned the connections where
the Wiring Plugs enter the Printed Circuit.

Could I try applying 12V to the Ign+ Post near the Fuel Gauge ? By my limited
understanding of what I've read the Regulator is in the Fuel Gauge and it
supplies the 7V to both itself and the Temp Gauge.
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Old 07-31-2015, 03:53 PM   #4 (permalink)
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Put this together.......

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Old 07-31-2015, 07:04 PM   #5 (permalink)
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Thank you, guys...

Going to try applying 12V to the Ign+ Stud near the Fuel Gauge and see if I get
any low voltage signal from the Fuel or Temp Gauge.

Will check Fuse Box again.

I really appreciate the help !
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Old 07-31-2015, 10:14 PM   #6 (permalink)
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Status Report...

Applied 12V to Stud near Fuel Gauge and Fuel/Temp Gauges operate.

Tracing the Printed Circuit led to the Yellow/Black wire that should feed it
12V. No power to this wire, pulled Fuse Box off Firewall and tested backside.
All Fuses supplying power through Fuse Box.

Ran new Jumper Wire from Fuse Box to Stud. A temporary fix but will get him on
the road and maybe eventually we'll follow the wire and fix. Previous Owner
wasn't kind to the Wiring in this Truck.

Thanks again for your help.
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