Peterbilt electrical problems

Peterbilt electrical problems DEFAULT
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  2. When you open the schmetic for what you want at the top is a place to click to enlarge the page. Just tried it and it works good.

    Wire 298 shows to come off the relay that is in the frame rail by the starter. It runs into the truck to the dash. It connects to the acc. relay. That is located behind the middle dash panel/ Relay may be bad.
  3. 94 should be behind the far left panel with the storage pocket better pull the wire through and inspect it good you will have to pull the lower steering.colum panel and unbolt the fuse box and pull it out some the wire tees off behind the fuse box also check the back of the fuse box the brackers are notorious for corroding and failing due to leaking windshields.the bracker on the frame rail gets its power strait from the starter
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    How to Troubleshoot a Peterbilt Electrical Panel

    The electrical panel on Peterbilt trucks is located in the front cab of the truck on the passenger or driver's side, depending on the truck model. It controls the truck's instrument cluster, including gas gauge, warning lights and the air pressure sensors. The panel includes a circuit breaker and fuses, and has color-coded wires to make maintenance easier. For example, white is grounded and red is protected up to 12 volts. If you're experiencing problems with your instrument panel or sensors, troubleshooting your electrical panel is the first place to begin looking for a solution.

    Step 1

    Reset your circuit breaker. If you have an outage in your dashboard, like a radio that won't play, you may need to reset your circuit breaker in the electrical panel. Circuit breakers are used to protect the circuit from power surges, and can occasionally blow out. Peterbilt circuit breakers can either be reset by a switch located in the electrical panel or by unplugging the entire circuit and plugging it back in. You can also consider replacing it with an automatically resetting circuit breaker.

    Step 2

    Check for corrosion. Corroded wires can lead to problems like alarms going off without cause or dashboard lights flashing on and off uncontrollably. Check for leaking around the electrical panel, which could be coming from the windshield or the pass-through holes that feed the wires into the electrical panel. Moisture can also freeze around wires, causing them to become disconnected. If you do see corrosion, have your wires replaced.

    Look for missing wire harnesses. If you or your mechanic has recently done work on your truck's electrical wiring, the wire harness might not have been replaced. The wiring harness bundles the wires together according to factory specifications, preventing chaffing of the insulation and eventual grounding and shorting of the circuit. It's also possible that the harness may have been replaced, but the wires were bundled incorrectly. Check the wiring diagram for your truck and rebundle your wires correctly, or replace the missing harness.

    Things You'll Need

    • Peterbilt wiring diagram
    • Wiring harness

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    Terry Hollis began writing professionally in 1999. His work has appeared in "Dance Insider Magazine," on BLARE.com and for short story readings at Emory University in Atlanta, where he now lives. He received his Bachelor of Arts in international studies from Morehouse College.

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    Old09-24-2006, 03:33 AM
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    Defaultelectrical problems 387 pete 2004

    occasionally when i open the drivers door the engine shuts off. I have no power at the key or ignition switch but I still have power in the bunk, 4 ways work, headlights work, once I turn the headlights off my marker lights stay on even though my headlights are off, after 15 or 20 minutes the power comes back on and I can start my truck, this last time it was 24 hrs. I've unhooked all the batteries to reset the ecn. I've changed the ignition relays, and am now baffled, anybody with any ideas?

     

    Old09-25-2006, 01:32 AM
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    Try the engine ignition circuit breaker, it looks like a fuse only bigger and it is labled in the fuse box. My 04 pete shut off when you turned the cruise on. Scary going down the road. but after you got off to the side of the road and turned the cruise off the truck would start. The circuit breaker was weak. Pushed in a new one and problem ended.

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    Old09-25-2006, 03:56 PM
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    have already tried the ignition fuse and another under the dash didn't help, thanks

     

    Old09-25-2006, 04:31 PM
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    There might be a cut wire somewhere in the door, and when it moves a certain way it might short out. Just a thought.

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    Old09-27-2006, 11:21 AM
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    I think the 387 are known to have electrical problems. Can't help you on your issue though.

    Have a look at this guys website and his repair logs - that would suck so bad http://www.mypeterbiltlemon.com/

     

    Old10-03-2006, 03:36 AM
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    I had the same problems. Push all of your relays in. If this solves your problem, spread out the prongs on each relay and reinsert it. The vibration is shaking them out causing a bad connection. This problem cost me a lot of money in 2004 until a road service guy told me the problem that 3 Peterbilt dealers just couldnt seem to diagnose. Let me know how it goes.

     

    Old02-01-2007, 10:29 PM
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    sorry after i found the problem i haven't checked this problem, but yes it was a relay under the glove compartment. After going to a few places and spending a lot of money replacing different things I ended up at a Peterbilt dealer and found it. Just a note to say thanks for the input.




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    peterbilt dash quit working ..fuse location

    PETERBILT CHASES ELECTRICAL BUGS

    Truckers may have finally found a way to chase down one of the biggest pests in the business.

    The Peterbilt Electrical System Tester, or P.E.S.T., introduced by Peterbilt Motors Co. of Newark, Calif., is a new diagnostic tool that helps to trace and identify problems in heavy truck electrical circuit wiring.The hand-held troubleshooting tool is designed to plug into the back of the electrical junction box on a Peterbilt truck to quickly check the wiring that runs through the firewall, including the most common chassis, hood and engine circuits running from the dash.

    P.E.S.T allows either a mechanic or operator to perform routine maintenance inspections, troubleshoot electrical failures or verify repair work. A trailer connector socket also allows the trailer circuits to be checked between the dash and the trailer plug, according to the company.

    The question of where the fault is when the lights go out is one which has pestered man for decades. In recent years, the pestilence has become a plague.

    According to a recent report by The Maintenance Council of the American Trucking Associations, the number of electrical circuits in a heavy truck has increased tenfold since the 1950s.

    While lighting problems account for only about 4 percent of truck maintenance costs, they are blamed for about 15 percent of needed repairs and 20 percent of equipment violations recorded in roadside inspections, TMC said. Many truckers feel that the coming of electronic instruments and controls will only stir up the hornet's nest under the hood.

    The new Peterbilt tool represents one of the first concerted efforts to strike back at the bugs. P.E.S.T. has a 10-foot connector cable which allows many of the instrument gauges to be checked visually from inside the cab, ending much of the wonder over whether the wire or the gauge is at fault.

    The new tool is now available as an option on all new Peterbilt conventional models.

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    Electrical problems peterbilt

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