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Hello. Welcome to Just Answer. Please allow me to assist you, as I see you have been waiting a while for help. Whilst not an Opel expert, blown fuses are caused by short circuits, and are common to any make and model. Please advise what, if anything, has been doe to check this problem. I will do my best to assist you.
Does the fuse blow only when you start the engine?
let's disconnect the battery. Then disconnect the wires to the alternator. Then reconnect the battery and retest. Please do not start it.
Let's disconnect the battery and reconnect the alternator. When the fuse is blown, the car runs Ok, is this correct?
what year is this Opel?
I am having great difficulty finding a wiring diagram for this vehicle on the internet.
It seems strange that the horn, the indicators and the reverse lights are caused to fail by starting the car. Since none of these units are integral to starting, perhaps the problem is in the Park/Neutral switch on the transmisison. If you have a short in the switch (which causes the reversing lights to come on when the selector is moved, thsi could blow the reversing light fuse.
I would like to try disconnecting the park.Neutral switch on the transmission and then turn the key to on; see if the problem disappears.
Let us look closely at the fuse panel. Does it have a small rectangular box attached to it?
Let us consider this: This really sounds like a body control unit internal problem. When we see bizarre problems that we cannot sort out, the most common denominator is the body control module.
This might not be the one you need, but my experience it telling me that this is what you need to replace.
This unit distributes power throughout the wiring. If the fuse in question passes thru this device, I would be replacing it.
Look at your wire diagram on the power distribution. Look for something that is some type of power distribution center.
If there is no separate box, then the power distribution is built into the fuse panel that is under the dash. I am thinking you have a cross circuit here. Has this vehicle every had body damage on ther fuse panel side, a water leak in that area, or the windscreen replaced?