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I noticed today that when I was driving home that when I applied the handbrake that there was no warning light on on the dash. Not long before that I had very stupidly not taken it off when I pulled away and there was a thump while I was driving. I thought my handbrake was broken at that point, but when I was stopped on a hill I applied and it worked fine, but no light came on. Will this be a sensor that is broken most likely? I am not sure even where to start looking. Any pointers appreciated. Cheers.

Hi SAU, Been having issues with my R33 GT-R. Battery warning light comes on at random times. Recently (1.5 months ago) had new alternator fitted, and new battery fitted (2 months ago). Car is used once a week and is always hooked up to a trickle charger. Between the time I had the new alternator fitted and today, car was running perfect, i.e no warning lights. Was at a stop light and decided to give it a 1st gear pull. What ensued was the battery warning light turning on and my tune getting messed up (AFRs reaching 15.9 with no throttle input, misfiring etc). Kept cruising for a bit, then decided to pullover and shut car off. Once I got going again warning light was gone, only for it to come back after a couple of hundred meters of driving. It should also be noted this is at night, with lights, and radio on only. I noticed that the warning light would turn off if I revved the car up aggressively (5000rpm+), at a stand still. Once revs dropped, light comes back on. However revving it up whilst moving would do nothing. Also when driving on bumpy parts of road, light flicks on and off, something must be loose right? I checked on the front and rear fuse boxes and everything seems to be plugged in. The high beams also struggle. The right side high beam comes on immediately while the left one has a little stroke before fully turning on. Oh and battery terminals are on nice and tight. Any ideas? I don't run any gear that would have heavy battery draw, and I get the car worked on by a reputable mechanic. In saying that, would it be possible for the alternator or battery to be malfunctioning this early in their lifespans? The car has traveled roughly 1000km+ since the new alternator was installed, no issues at all during that time. I will say though, the battery voltage while driving has never exceeded 13 volts, usually 12.x (with this new alternator). I think 14.x+ is the norm. Before I got this new alternator the voltage reading was around 10 to 11. When I got home I hooked up the trickle charger and it took a while for the light to go green (charged/maintaining). Usually after a drive, short or long, the red light on the trickle charger only lasts for less than 10secs, sometimes it goes green straight away. But today it took considerably longer than usual to go green, indicating the battery was not charging(?). Any and all help appreciated guys and gals, will have a chat to mechanic on Monday, however I thought I'd see if I could get quick help and fix straight away.