low beam fuse
03-09-2017, 10:58 PM
#1
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Location: Westminster, MD
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low beam fuse
looking for help...my '86 944 keeps blowing the driver's side low beam fuse. 7.5AMP, I believe. Put a new one in, head lamp works for a while, next day or so fuse is out again....not sure what is causing the fuse to keep blowing
passenger side no problems - high beams no problems. just driver's side low beam fuse. could it be a bad headlamp?
passenger side no problems - high beams no problems. just driver's side low beam fuse. could it be a bad headlamp?
Last edited by hammergb; 03-12-2017 at 02:14 PM.
03-10-2017, 12:39 AM
#2
Burning Brakes
Try putting a slightly larger fuse, 10 or 15 amp.
If there is an intermittent short in the wiring, it will blow the fuse.
If it is just the headlight, then the fuse may hold up.
You can get small shorts in the filament coils in a light bulb. If you do replace the headlight replace both, especially if they are old. The lighting will be better.
You could also try swapping the headlight to see if the problem follows the headlight or stays in place.
If there is an intermittent short in the wiring, it will blow the fuse.
If it is just the headlight, then the fuse may hold up.
You can get small shorts in the filament coils in a light bulb. If you do replace the headlight replace both, especially if they are old. The lighting will be better.
You could also try swapping the headlight to see if the problem follows the headlight or stays in place.
Last edited by PaulD_944S2; 03-10-2017 at 07:44 PM.
03-10-2017, 11:29 AM
#3
The wiring that flexes for the pop up headlight is a good place to look for a short.
I can't say that I never put larger fuse in a circuit myself, but it's really a bad idea especially on marginal European wiring.
I can't say that I never put larger fuse in a circuit myself, but it's really a bad idea especially on marginal European wiring.
03-13-2017, 10:20 AM
#4
Pro
+1, that was my problem. After hours and hours of troubleshooting, we finally found breaks on both sides behind the headlights. The insulation had worn off with flexing and with rubbing up against the headlight bracket on the back. I agree with Marc, I would avoid putting in a higher amp fuse, they are meant to be fail-safes and if you increase the amperage you never know what might blow before the fuse, instead of the fuse being the first thing to go.