Engine cuts off when headlights pop-up
#1
Rennlist Member
Thread Starter
![Question](https://rennlist.com/forums/images/icons/icon5.gif)
Dear friends,
I encountered a very strange electrical issue.
Yesterday, I noticed that one of my H4 headlight-bulbs is faulty. So I assumed I just had to replace the H4-bulb.
Today, I drove again and during night fall I wanted to pop-up my headlight during
driving when suddenly the engine halted....
I tried several times and each time my headlights were activated, the engine stopped...
Once at home I removed the faulty bulb and problem was gone ?????
IS THIS POSSIBLE ??? CAN A SHORTCIRCUIT IN A BULB CAUSE ENGINE FAILURE (AS IF IT CAUSED A SHORT CIRCUIT IN THE BATTERY ????)
I encountered a very strange electrical issue.
Yesterday, I noticed that one of my H4 headlight-bulbs is faulty. So I assumed I just had to replace the H4-bulb.
Today, I drove again and during night fall I wanted to pop-up my headlight during
driving when suddenly the engine halted....
I tried several times and each time my headlights were activated, the engine stopped...
Once at home I removed the faulty bulb and problem was gone ?????
IS THIS POSSIBLE ??? CAN A SHORTCIRCUIT IN A BULB CAUSE ENGINE FAILURE (AS IF IT CAUSED A SHORT CIRCUIT IN THE BATTERY ????)
#2
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I am not sure what model year you have, but I had the same thing happen on my 1980 928. Whenever I turned on the main pop-up headlights, the engine would cut out. In my case it was fixed by replacing the headlight relay. I am not sure how it would cause the engine to die, but that's what happened to mine.
Good luck!
Carl
90GT project
Good luck!
Carl
90GT project
#3
Rennlist Member
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Indeed mine is also from 1980, a Euro model.... Probably relay is not fused which
causes a short circuit on the whole system...
thanks for your feedbacl
causes a short circuit on the whole system...
thanks for your feedbacl
#6
Rennlist Member
Thread Starter
![Question](https://rennlist.com/forums/images/icons/icon5.gif)
..interesting thought about that ignition switch, because I can pull out
the key of the ignition lock and engine keeps on running.... can come in handy in cold winters :-) but never could forsee any other side effects...
How is this related to bad ignition switch ???
the key of the ignition lock and engine keeps on running.... can come in handy in cold winters :-) but never could forsee any other side effects...
How is this related to bad ignition switch ???