I collected a bunch of fuses from somewhere at some point, and now I'm not sure what I have, see pic below. I have two kinds of white fuses, one has a much thinner metal strip than the other, and one's a darker white. Do these have different amperage ratings?
Second question, since I installed foglights on the w115 240D, the fuse that powers the passenger headlamp and both fogs has blown twice. I thought it was just the additional current from the fogs (which were installed in the factory sockets provided on the rear of the headlights, I didn't add any wiring) but now I think I've found the cause...
Tonight when driving home, the headlights and dash lights (I quit using the foglights for now) got really bright and the heater blower got loud. I quickly turned off the blower since I don't want that motor to burn up. The lights stayed bright for a few seconds then went back to normal. Then it happened again for a few seconds and returned to normal and didn't happen again for the rest of the drive. This occurred while driving on the interstate at speed. The engine speed didn't vary much.
I kind of remember this happening before but it was so brief and the time between occurrences is long enough for me to forget about it, but sometimes I have a belt squeal even though the belts feel pretty tight. I don't have a tension gauge to check, but they're not loose enough to be squealing. But the belt squealed earlier tonight, and I'm wondering now if its the alternator belt from the sudden high demand for current from the alternator. And if the lights (and other electrical components) are suddenly drawing more current, maybe that's why my fuse with the three lights on it blows).
Does this sound like a voltage regulator problem? I haven't checked it yet in this car, so I'll probably pull it some time soon to look at it. But if anyone has any other input, I'd appreciate it.