Skip the auto shop - Our mechanics make house calls

Q: Charging problem - 1999 Cadillac DeVille

asked by on

After replacing the alternator and the battery on our '99 Deville, we are not getting any power through to the ignition system. I have checked for loose connections, ground is good, alternator tested good and battery is new. What should I check for now? Before replacing these items, testing showed a bad alternator and a very old battery. Thanks!

My car has 110000 miles.
My car has an automatic transmission.

A: First, you should check for injector pulse ...

First, you should check for injector pulse and fuel pressure. If either of these are not working, then there are some specific diagnostic paths to follow. If it is only spark you are missing, check all the fuses.

Make sure to check them all as we never know if one fuse supplies power to another. If all the fuses are good, check for power and ground at the ignition module. If you don't have power or ground at the module, you will need to trace the wires back until you find the bad connection. Check harness connectors and fuse blocks before you start tearing into a harness.

I mentioned the injector pulse first. This is best tested with a noid light. If you don't have injector pulse, the most common cause is a bad crank sensor. This can be checked with a scanner. If you don't have a crank signal on the scanner, hopefully there is a code to guide the diagnosis.

If you require more assistance with this diagnosis, I recommend the following inspection to help you out. A certified professional from YourMechanic can come to your car's location to inspect the vehicle's loss of power so that this can be corrected.

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: Power steering belt broke & need to replace it. How do I replace it?

Typically, you would loosen the mounting bolts for the power steering pump and adjust the angle of the pump until the belt is loose enough to remove. There may be one or more belts for other accessories in front of...

Q: Battery dies out after a few days and everything checks out fine

Sounds like you may have a parasitic draw that is taking down the charge level on the battery. The vehicle has a process by which the computer in the vehicle are shutdown to prevent draining the battery. Sometimes a faulty...

Q: i need a alternator

Hello, thank you for writing in. You are correct in thinking that your charging system has failed. This is very likely the situation at hand. With that being said, you should still have your battery tested. Typically this is a...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.