Skip the auto shop - Our mechanics make house calls

Q: No electrical power

asked by on

This morning I went to start my 85 Suburban and all sounded good very briefly then nothing. I have dual batteries fully charged in 6.2 diesel, i turned the ignition on heard the buzzing waited glow plugs lit up then I turned it over. The starter turned the motor for a single rotation then nothing. I turn the key off and on and nothing. The buzzer does not work it basically seems like I disconnected both batteries and not even the headlights work.

My car has 51000 miles.
My car has an automatic transmission.

A: This sounds like quite likely a grounding p...

This sounds like quite likely a grounding problem. I would recommend starting by checking the positive battery cables looking for corrosion on the connectors and cables.

Next, I would check the fuses for power. Try checking one for the headlights to see if they have power. Sometimes what is called a fusible link can burn up causing a ground problem.

Also check the rear trailer plugs (if applicable) to see if they have any exposed wires or corrosion as they have a tendency to have the insulation worn off which can also cause a short.

Check the ignition switch for bad wires, connections, or burnt wires. As you may know, tracing electrical shorts can be very tedious and time consuming. I would recommend having an expert from YourMechanic come to your home to diagnose the electrical issue and help you repair it as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Truck died on road

You may have an intermittent problem with the fuel pump or the fuel pump is not pumping enough pressure. The other possible problem you have is excessive dirt and debris in the carburetor fuel inlet. This may have dislodged when...

Q: Dimmer light not working - 1991 GMC K2500

Hey there, thanks for writing in about your 1991 GMC K2500. You should have power on the white wire, dark green wire, and also the brown wire when the dashboard lights dimmer is turned on. If you need help having...

Q: Leak keeping top from going up.

Hello. I have found that the most common cause of leaking fluid on this system is the hydraulic piston assembly. Over time the seals start leaking and allow the fluid to come out and many times the top will not...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...