Hi All,
After a little trouble shooting assistance chasing down an issue I'm having with my wagon.
So I'm losing voltage when I tap the brakes, only on initial application, when the lights get activated.
It's enough to turn my head unit off (basic single din install no amps) which is how I noticed it, and visibly bump my volts gauge down to around 10 volts.
It's only temporary on initial brake application and if i hold my foot on during a normal stop it pops back up and away we go again.
It's really intermittent, its happened three times in about 15 drives, but when its happening it can even drag enough down to cause a cough through the engine as it runs out of voltage to run the coils and ecu.
It has stalled the car at idle when I was playing around in the garage trying to find it..
I have turned off everything feasible (stereo, AC, fan etc) in car when it's playing up, no difference.
Bought a new battery last week after seeing some funny voltages at the battery, was pretty old anyway, happened again today (NS70 suits C34s BTW, skyline stuff isn't tall enough and the battery clamp wont work without adaption).
All 5 brake lights are visibly working, havent inspected the globes or holders yet.
Voltage and resistance through the globes via the brake switch seem reasonable.
Thinking this through I think the brake application is a trigger but not the cause.
If I had a short or something in the brake light circuit it should just blow the fuse in that circuit and not cause any other systems to be affected.
I'm thinking alternator reg isnt keeping up with sharp changes in load and pooing its pants so to speak, but the battery should be able to keep up and maintain.
I guess if alternator is the issue, my new battery is now getting low and not getting charged properly meaning it cant keep up when its having a bad day.
Anyone else got any ideas to look at before I order a replacement alternator?
I know this place is the awesome to access pretty cluey, helpful and experienced people so thanks in advance.