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.

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 1,000 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!
  1. Home
  2. Questions
  3. No electrical power

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Choose a carburetor for 454 Chevy engine

Hi there. For the carburetor swap out, you will need to have a least a CFM of 850 or 950 for a big block GM engine. If you are concerned about fuel consumption, then you could do a CFM of...

Q: ABS Brakes VSC

That is a code for the yaw rate sensor. It may be able to be cleared after a zero point calibration is carried out on the yaw rate sensor with a scan tool capable of resetting the yaw rate sensor....

Q: The pulley is making a rattling, ding ding ding sound occasionally when I'm driving, how do I fix this?

Hello: In most cases, this sound is an indication of a loose pulley; which might be caused by worn out center bearings or misalignment. The best way to attempt to fix this is remove the belts, then try to wiggle...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.