[DeltaGTI]

I am looking for which fuse turns on when the ignition turns on? Trying to set up a boost gauge and wishes it to turn on when I turn on the key. Which fuse can I tap into? 1.8T.

 

[ttg4l]

Fuse 31 - Automatic transmission. Present on all MK4s, including manual ones, and is an unused slot that is still switched with ignition. Plenty of info on Google, and easily identifiable with a multi-meter, test light, or bulb and some wire (home made test light).

 

[birchjohn237]

I am looking for which fuse turns on when the ignition turns on? Trying to set up a boost gauge and wishes it to turn on when I turn on the key. Which fuse can I tap into? 1.8T.

Hi,
not exactly Ignition fuse but on a similar viegn,all the dashboard lights(except the speedo &Rev;counter)do not come on with the lights,I have looked through the Hayes Manual and also the drivers hand book and the "Fuse Guide" in the drivers door post but none are any help,any suggestions?(1.9 diesel Bora on a V plate) a frustrated,J.B.

 

[adam-]

5A fuse, can't mind where.

 

[DeltaGTI]

I ended up using the cigarette fuse. It's always on. The unit itself only turns on when the light is switched on. Clever design. I initially thought the unit can turn on without the light but it doesn't. Only when the light is switched on the unit works.

If the light isn't switched on the boost gauge ceases to function. I know peple was worried about power drain but I do not think it does..