Why does the fuse for a 1994 Pontiac sunbird keep blowing its a 30 amp?

Answer 1

9/24/2005 Please find this shorting problem asap!!! You are going to have a car fire and loose everything! Some automotive stores have resettable fuses that have the contact footprint that matches your plug fuse block. Get one for 5 amps immediately and insert it in the fuse block in place of the 30 Amp fuse. Now you can safely proceed to look for the problem. You can take a boy scout compass and place it next to different wire harnesses in your car and see which branch gives a swing of the compass needle. This is where the current draw is flowing. Once this group of wires is found, you can find an end or carefully cut open the harness wrap and find the color coded wwire that is the offender circuit. You can now go to the connector block or harness component and open this circuit wire. You didn't identify the function name given by the silkscreen next to the 30 amp fuse on the fuse block. What you describe, sounds like an intermittent or beyond design current draw for the particular circuit function. You are going to have to keep track of the circuit function by name and see what seems to cause it to blow. An example would be the 'power window' circuit. Does it blow only when you use a particular window? If it only blows with a particular window, it may be the motor itself. This will eliminate at lot of harness wiring in the doors and chassis as it is related to specific door. Does it blow, regardless of what windom is moved? This will tend to indicate the driver's door wiring is the problem. etc. Please do yourself a favor and either fix the problem short circuit or else keep the fuse out of the fuse block until you have the time to complete the job. A good clue is to see what function of the car does not work with this fuse removed if there is no name by the fuse. 30 amps with a 12 volt battery is 360 watts which will burn up the wire harness in a very rapid manner, once it starts. The battery can out put in excess of 450 amps and once a harness fire starts, its good bye car unless you can disconnect the battery itself. Mort