Hi Steve,
This can be a tricky fault to track down.
Assuming that fuse 7/8 is the one that keeps blowing you need to isolate where the short circuit is. This fuse should feed the following in a MK2
1) Panel dimmer rheostat
2) LH side light
3) LH tail light
4) Number plate lamps
5) The coil on the night dimming relay (if you have one fitted)
I would start by disconnecting the battery -ve terminal, pulling the dash forward and unplugging the red/black wire on the panel dimmer rheostat, disconnect the red wires from the night dimming relay (if fitted - it may be still be fitted even though the function has been disabled - so check) , disconnect the red/black wires from the LH side light and LH tail light, finally disconnect the red wires from the rear number plate lights. Make sure you tape up any exposed connections.
Now switch OFF the lights and then fit a new fuse and reconnect the battery - does this blow the fuse?
If fuse not blown then switch ON the sidelights - does the fuse blow now?
If fuse is still OK then turn the panel light dimmer to the fully dimmed position reconnect the above items one by one until the fuse blows again - if not blown then turn the dimmer up bright - which was it that made it blow?
Let us know how you get on.
Simon
PS - ONLY REPLACE FUSES WITH THE BATTERY DISCONNECTED TO AVOID BURNT FINGERS!
This can be a tricky fault to track down.
Assuming that fuse 7/8 is the one that keeps blowing you need to isolate where the short circuit is. This fuse should feed the following in a MK2
1) Panel dimmer rheostat
2) LH side light
3) LH tail light
4) Number plate lamps
5) The coil on the night dimming relay (if you have one fitted)
I would start by disconnecting the battery -ve terminal, pulling the dash forward and unplugging the red/black wire on the panel dimmer rheostat, disconnect the red wires from the night dimming relay (if fitted - it may be still be fitted even though the function has been disabled - so check) , disconnect the red/black wires from the LH side light and LH tail light, finally disconnect the red wires from the rear number plate lights. Make sure you tape up any exposed connections.
Now switch OFF the lights and then fit a new fuse and reconnect the battery - does this blow the fuse?
If fuse not blown then switch ON the sidelights - does the fuse blow now?
If fuse is still OK then turn the panel light dimmer to the fully dimmed position reconnect the above items one by one until the fuse blows again - if not blown then turn the dimmer up bright - which was it that made it blow?
Let us know how you get on.
Simon
PS - ONLY REPLACE FUSES WITH THE BATTERY DISCONNECTED TO AVOID BURNT FINGERS!
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