Q: my truck when I turn the key I have no power but when I jump it it starts up.

asked by on

I got a short in it a few months ago. so I found the short repaired it. the truck would not start it did nothing like it had no power not even the head lights will turn on so I checked for power from my battery to my fuze box, and to my starter. had power every were I checked. on the truck. but if I jump it it will start up and run just fine. turn it off nothing again. so I thought I fried the battery even though I had 12.3v I my not have the amps. so I bout a new battery. and I have the same thing happen. I am at a loss.

My car has 200000 miles.
My car has a manual transmission.

If you have a new, fully charged battery, and the starting system still does not function, there are actually only a relatively limited number of causes. Broadly, either the starter motor/solenoid assembly is faulty or the electrical circuit supplying the motor has a fault. That circuit begins at the battery and includes grounds, wiring (some of which is very heavy cabling), fuses, relays, the ignition switch and terminations. Basically, the starter is either getting power or it isn’t. If the starter motor is getting power but it doesn’t work, the starter is condemned and replaced. Alternatively, if there is no power to the starter, then the circuit is traced until the fault in the circuit is found. Notably, faults can include high resistances, due to corrosion, wire strand breaks, or loose terminals, which can only be diagnosed using a voltage drop test. If you desire that a certified mechanic resolve this promptly, please simply request a no start diagnostic and the responding mechanic will get it diagnosed and repaired for you. Please let us know if you have further concerns or questions as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. my truck when I turn the key I have no power but when I jump it it starts up.

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: Which GM pick up rear end has posi, disc brakes and will match my 67 measurements?

Hi there. The axle from a 2001 Chevrolet Camaro should fit your 67 GMC. The axle is about the width of your original axle and it has disc brakes with the posi loc traction control in the differential. If you...

Q: Car won't start, latching noise

If when turning the key you hear a loud click or latching noise, that may be the starter gear kicking out to contact the engine flywheel in an attempt to start. Test the battery while trying to start the vehicle....

Q: I have a 1994 Ford F150 XL 4x4 with a EFI 5.0 liter v8 it has a hard time starting when then engine is warm

Hello. You are most likely having problems with the fuel injectors clogged and there is carbon built up on the valves. Try using an injector and combustion cleaner to clean injectors and reduce carbon buildup on the valves. Have the...

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...
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 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...