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 Headlights dim when on the gas pedal. | Joined: Sep 2015 Posts: 139 Likes: 11 member | OP  member Joined: Sep 2015 Posts: 139 Likes: 11 | When I let up off the gas pedal, the headlights brighten up, but when holding the gas pedal, even on level ground, the headlights dim. | | | Re: Headlights dim when on the gas pedal. | Joined: Jul 2014 Posts: 4,805 Likes: 123 Uncle Rust N Dents | | Uncle Rust N Dents Joined: Jul 2014 Posts: 4,805 Likes: 123 | Sounds like an issue with the alternator or a bad ground. | | | Re: Headlights dim when on the gas pedal. | Joined: Apr 2010 Posts: 2,847 Likes: 42 veteran | | veteran Joined: Apr 2010 Posts: 2,847 Likes: 42 | Belts do not always squeal when they slip.
I've witnessed this with an optical tachometer on a boat. a 2 to 1 pulley ratio was reading as if it were a 1.5 to 1 at 1200 rpm but was 2:1 at idle
A slipping belt would most easily explain this symptom, but do always find and clean the grounds wherever you find them | | | Re: Headlights dim when on the gas pedal. | Joined: Jul 2019 Posts: 11,383 Likes: 430 Post Junkie | | Post Junkie Joined: Jul 2019 Posts: 11,383 Likes: 430 | I agree with Rusty. I bet it's a ground. All good advice though. | | |
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