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dodgefan1.lw 10-31-2013 09:10 PM

Instrument cluster gauges reading wrong
Hi, I have a 94 4x4 1500 ram with a 5 speed manual and the 318. I have a problem of when I put an electrical load on the vehicle the gauges all move a different direction. The oil pressure gauge seems to move the most. So, any time I turn on the head lights, ac, brake lights the gauges give false readings. They don't move to far, but still enough for me to notice. When both my lights and ac is on the oil gauge reads just over 50 psi. The normal reading before this started happening and when the load is taken away is right at or slightly above 40 psi. to my knowledge this gauge is all factory, no added gauges. Oil is still stock, not mechanical. I bought a new batter about a week ago and I check alternator output today and it was about 110 amps at 1500rpm(90 amp spec at 1250rpm). The problem has been occurring for a while, so before I got the new batter which did not change the readings.
I'm not sure where to start.....maybe back fed voltage through a ground? if so where would that ground be located?
Thanks for reading and any help or suggestions are appreciated!

Warlock III 11-01-2013 02:27 PM

The first two grounds I'd check are the battery to body ground, and the engine to body ground at the firewall/back of the block.

mike keffer 12 11-21-2013 08:44 AM

my 2003 ram 1500 is showing NO-BUS in the odometer.i have no instrument gauges reading.what is causing this and how do I fix it

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