Temperature gauge and fuel gauge quit working simultaneously after valve job

Uncle_Paul · Post by **Uncle_Paul** » 07 Jan 2016, 20:54

1993 Volvo 240 fuel and temp gauges don't work after valve job

93Regina · Post by **93Regina** » 07 Jan 2016, 23:36

Uncle_Paul wrote:1993 Volvo 240 fuel and temp gauges don't work after valve job

If other warning lights, speedometer, etc., are working on cluster, then the onboard voltage regulator has shot craps, or its not getting power, or that circuit is not flowing current.

harryhendo · Post by **harryhendo** » 08 Jan 2016, 06:36

The temp gauge gets its signal from a coolant temp sensor screwed into the block, which may have been disconnected during the valve job. Check the wiring connector at the sensor under the intake manifold.

Uncle_Paul · Post by **Uncle_Paul** » 10 Jan 2016, 05:17

Thanks again for your help. Yes the wire is connected to the sending unit. I should check that wire for continuity I suppose. Did I read somewhere that those two gauges were powered by a 'voltage stabilizer'? Or is it just coincidence that they both decided not to function after valve job? Hmmm.....bad ground to one side of cluster? Is that possible?

Uncle_Paul · Post by **Uncle_Paul** » 14 Jan 2016, 03:45

After running motor for ten minutes, shutting it off for ten minutes turned the key and got silence. She blew that big 'ignition' fuse in the little box at the positive battery post. Smoked it good. .....everything was fine a few minutes ago. So I wonder if this is possibly related to the gauges not working? I apologize for the lousy grammar, etc. Any ideas where to begin would be much appreciated. Thank you for your time.

93Regina · Post by **93Regina** » 14 Jan 2016, 07:17

Uncle_Paul wrote:1993 Volvo 240 ...big 'ignition' fuse....

Only late model 1993-240s got this setup, so which fuse?

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Uncle_Paul · Post by **Uncle_Paul** » 14 Jan 2016, 13:43

60 amp ignition fuse. Thx

93Regina · Post by **93Regina** » 14 Jan 2016, 15:28

Uncle_Paul wrote:60 amp ignition fuse

Remove small fuse #3 (25 amp) and small fuse #13 (16 amp)

I would get two jumper wires with spade terminals and attach them to the big fuse receptor, and hook an amp gauge up to those wires.

With key off, check for a amp drain...with key on, check amp draw...start it up, and check amp drain

93Regina · Post by **93Regina** » 14 Jan 2016, 15:30

Uncle_Paul wrote:60 amp ignition fuse

What does this fuse have it rated as?

Uncle_Paul · Post by **Uncle_Paul** » 16 Jan 2016, 21:08

Don't understand the question. I ain't the sharpest knife in the drawer. Haven't been in a dc voltage puzzle quite like this before. Been reading some and am now looking at that original alternator and maybe relatives thereof. I'll do as you say and get back with info. Car is not at my home or work so have to tote tools, etc. thx again