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Topic: Voltage/Speedometer on 1999 CC Magna Build# 5591 (Read 765 times) previous topic - next topic
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Voltage/Speedometer on 1999 CC Magna Build# 5591

Yahoo Message Number: 88819
My Voltage gauge is showing 11 Amps but I measure 13 Amps getting to the batteries. Also my Speedometer(odometer shows eeee) quit working all of a sudden, the needle just cycles up and settles back once in a while. All other gauges are fine. I ran a separate ground wire to isolate any noise from ground, no change to the gauges.
Has anyone had a similar problem?

I do not have a wiring schematic and do not know where the sending unit is, although all the gauges seem to use wire 34.

Re: Voltage/Speedometer on 1999 CC Magna Build# 5591

Reply #1 –
Yahoo Message Number: 88828
Assuming you have a Cat engine I think this about the time frame they started using the new ECM's and if so I would guess your getting an intermittent open in the data wire that runs from the engines ECM to the transmissions ECM to the ABS then to your gauges. The data wire also has a resistor on both ends of the data wire which I have also heard of going bad in rare cases. Most of my gauges quit working and this was the case. I found the insulation on the data wire compromised up close to where it went to the ABS in the electrical bay and corrosion had done it's damage. I spliced it and all has been well since. If that's the case the trick if finding the open. Good Luck Kevin Burns

2000 Affinity #5865

Re: Voltage/Speedometer on 1999 CC Magna Build# 5591

Reply #2 –
Yahoo Message Number: 88835
Thanks, I do have the Cat C10 engine, I believe the ABS is in the compartment under the drivers seat on my unit. I will look there.

Your help is greatly appreciated.

Re: Voltage/Speedometer on 1999 CC Magna Build# 5591

Reply #3 –
Yahoo Message Number: 88842
You'll probably have to check the wire from the engine ecm to the gauges to find the open if you have one. It just so happens that was the location where my open was.
Kevin Burns

2000 Affinity #5865
 

Re: Voltage/Speedometer on 1999 CC Magna Build# 5591

Reply #4 –
Yahoo Message Number: 89127
Well, after much help and a trip to a local shop, the problem was a bad vacuum pump in the dash heat/SC unit that fried some wires and apparently shorted out the speedometer gauge.
Thanks again for the help from this forum, apparently the speedometer gauges on the 1999's Magna are known to go. Need to find a source for the vacuum pump as the manufacturer needs three weeks to build one.