Hello all,
New to the forum ( hence the name) and thanks for accepting me. My ride is an 87 gmc v2500. Anyhow, it has a pulsating issue when the headlights are on. The voltmeter will also twitch back and forth. Doesn't do it with just the marker lights on. I've checked all the grounds and they appear to be in good condition. I considered the headlight switch but figured if it was that then the pulsating would also occur when just the marker lights are on. I thought i ask on here before throwing parts at it.