Speedometer?

Question:
i have a 91 plymouth acclaim i got two things wrong my lights for like too see how fast im going at night aint turning on what fuse would it be and my speedometer aint wokring what could i do to try fixing it

Answers:

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I have no idea what Philip is talking about. I think he taped the wrong key on his web search.
The speedometer is most likely run by a speedo cable that is ether broken or disconnected (also could be a worn out speedo drive gear in the transmission). As for the dash lights, there hooked to the running lights. If the running lights work, it might be a bad wire, bad dim control or burned out dash lights.

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On a Series III XJ6, the speedomoeter transducer is on the right side of the transmission, towards the rear, with two wires (one green, one yellow). Speedometer problems are almost always due to transducer failure although sometimes the speedometer itself will be faulty.

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This is a pretty easy circuit to test if you have a voltmeter. Green wire to the transducer should have 12V with key on (check fuse #4, too.) Also, the green wire at back of speedo should have 12V with key on. Black wire from speedo should be grounded (ground point G14 behind speedo). If all of these check good then you can test the transducer for output voltage.

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General concensus is that the transducer produces a square wave form AC output. So, with your voltmeter set to AC and the igniton key "on", spinning the transducer cable (a drill motor would be nice for this) should produce some sort of a reading from the yellow wire. (Of course, checking the wave form would require an osciliscope so it's not easy to check the quality of the output.)

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If no output at all you've got a dead transducer. If you do have output but still the speedo is inoperative then you've got a dead speedo or an open circuit between transducer and the speedo.

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Your light switch may be broken, I had a 91 dodge and the dimmer switch was shorted and had to mess with it to get the lights to come on, eventually replaced it. HAve you tried turning the dimmer all the way to where the dome lights come on, that should make the instrument panel lights come on too. I would say it is not a fuse but a loose connection or broken switch. I am not sure if the speedometer is mechanical or electrical. If it is mechanical the cable may have snapped. If it is electrical the sending unit on the transmission may be broken or the speedometer itself is broken in either case. Sorry there are so many options but you have to go and eliminate all the possibilities one by one.
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