headlights going dim

dj_lindzy

New Member
hey guys while in driving along my headlights are dim then when i get off the accelerator they brighten up until i get on the gas again! i recently inslalled fog lights and they dont do it im guessing because there on separate loom any ideas? ive checked the earth connection and fuses etc
 

Steve99

Active Member
Only thing I could think of is either you might need a new battery. Or alternator?
Don’t think relays would cause issue like that
But if it’s not a major problem I wouldn’t stress

My lights dim when I open or close the windows. Maybe it’s a lancer thing lel
 

dj_lindzy

New Member
Only thing I could think of is either you might need a new battery. Or alternator?
Don’t think relays would cause issue like that
But if it’s not a major problem I wouldn’t stress

My lights dim when I open or close the windows. Maybe it’s a lancer thing lel
Had the alternator rewound just after I brought the car and still the same so my battery die a few weeks back and the lights were still the same. So none of those are the issue unfortunately
 

Steve99

Active Member
Are the connections in the battery clean and not covered in dirt.
When did you replace the bulbs last?
Have you had the voltages checked. Maybe your making more than 12v or so. Or less

What about when you rev when the car is in neutral? Does it dim and brighten?
 

donki

Administrator
Forum Administrator
So its dim when the engine/alternator is under load, but lights up when off load?
 

dj_lindzy

New Member
Are the connections in the battery clean and not covered in dirt.
When did you replace the bulbs last?
Have you had the voltages checked. Maybe your making more than 12v or so. Or less

What about when you rev when the car is in neutral? Does it dim and brighten?
Not sure if it does it in neutral I’ll have to check that.
Bulbs are about 2 mths old, checked and cleaned earth on battery aswell as checking all the fuses and the body to motor earth
 

pelican

Active Member
bad/failing wiring somewhere that's not quite failed enough to be an open circuit, but just enough to jack the resistance way up out of spec?

would be interesting to get a multimeter across the loom and see what it reads, but i have no idea what it should read
 
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