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Old 09-09-2019, 08:49 PM   #1
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Posts: 245
Losing power to dash

Today while traveling on I80 in western Nebraska, I lost all of my gauges, and as I pulled to the shoulder, the engine shut down. I turned the key off for a few seconds. When I restarted the engine, everything seems normal.

While trying to diagnose this issue, I pushed the auxiliary start switch. The dash lit up as though I had turned on the key. But the key was not in the ignition. Can anyone shed light on this problem.

2010 Phaeton on Freightliner chassis.

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Old 09-10-2019, 09:22 AM   #2
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Join Date: Jun 2016
Location: Nine Mile Falls WA / Arizona City AZ
Posts: 978
Most of the freightliner Chassis I have looked at have a black and white wire running directly to the batteries... this lead has a small fuse in the circuit and runs directly to the ECM... I had a neighbor who had his battery chassis batteries changed and the dealer put the black (hot) on the ground side... I spent a few hours trying to lean why the engine wouldn't start...

I finally noticed that none of the dash gauges worked and contacted Freightliner... he sent me a wiring diagram and sent me to the tests that check for voltage at the correct terminals when the KEY IS OFF...

Once I got the wires correct it started and ran fine and the gauges were good...

It's my guess that those connections are bad... and need to be cleaned...

Hope this helps..

Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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Old 09-20-2019, 09:11 AM   #3
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Iíve cleaned connections at starter, batteries, and behind dash. Have since driven 1000 miles with no issues. Thanks for your input.
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