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

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: I was driving my 05 Escalade today and all of a sudden the engine started revving up. I pulled over, put it in park, then back in

Hello, most of the time this is caused by a failing throttle body. These are a common failure on this vehicle. The accelerator motor or throttle position sensor fail and causes this. The accelerator pedal assembly can also fail causing...

Q: Car won't start

Hi there: Thanks for writing in about your 1998 Dodge Neon. To answer the question, YES, dirty and corroded battery terminals are a major cause of engine staring issues. A good rule of thumb anytime you purchase a used car...

Q: Roughly How much will it cost to fix an issue with my alternator not charging

Hello, and thank you for writing in. It sounds like you need a new alternator. That can be tested to make sure it's the issue. The exact price is going to vary based on the mechanic and what they charge...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...