How to Troubleshoot the Electrical System in a Chevy Silveradoby Contributor
The Chevy Silverado is a workhouse of a pickup truck. The 2500HD and 3500HD models are made for towing heavy loads. The Chevy Silverado 1500 is the more passenger friendly version that benefited from a redesign in 2007. Luckily, the electrical systems of all Silverados hit more than they miss. Still, it pays to know where to look if you do experience electrical problems.
Expect the more common electrical system problem to affect the lights. When interior lights start flickering or just don't want to work at all, your first step is to check fuses and relays. If that checks out, look for a loose wire connector. Don't forget to check the ignition switch too.
Examine the ground cable from the engine to the firewall, particularly if you're experiencing more than one electrical problem. Connections particularly come loose around the firewall.
Check your wiring if you flip a turn signal and instead get emergency flashers coming on. This happens sometimes when trailer wiring has been added, causing electrical system problems.
Consider having the BCM or Body Control Module replaced if your Silverado repeatedly blows out the same fuses or if it seems like you're experiencing one electrical problem after another. This job must be done at the dealer so that they can flash the computer after replacement.
Contact GM if a relatively new Silverado starts acting up. It could be that there is a TSB (technical service bulletin) or recall that addresses the problem. If so, give your dealer the TSB number and expect to get your repair made for free.
- Since 2007, the newly designed Silverado shares the same platform with the Chevy Tahoe and GMC Yukon.