Question about 1999 Isuzu Rodeo
If you just had a radio installed and your marker lights are blowing the fuse then whoever installed your radio hooked up the dimmer wire incorrectly, it either needs to be capped off or taped up, it's probably connected to the radio's dimmer input to the wrong polarity
Posted on Feb 19, 2012
Ck to make sure the radio itself is not pinching any wires wiggle the wiring harness around .. a blown fuse is a direct short but also try this disconect one marker lite at a time you could have one bad marker lite causing the problem it could be just a coincidense with the radio installation
Posted on Aug 24, 2009
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The tail and marker lights and Instrument lights are on the same circuit so both will go out if the fuse for this circuit blows. If fuse continues to fail, check the tail light or marker globes, including the globes for the number plate, for a globe that may have an internal short causing the fault and replace as necessary. As you have already checked the wiring near the light fittings for any chafed wires that could be shorting to the body causing the fault, then a closer inspection of the wires inside all the light assemblies for any shorts may be needed.
It could also be that the instrument dimmer control has failed and is causing the fault. The electronic bits inside the dimmer control for these lights sometimes go faulty. Try disconnecting the connecting plug on the rear of the dimmer control and checking if fuse still blows. If fuse continues to fail, then the fault in the tail and marker lights circuit.
Remove all the tail, number plate and running light globes from the light assemblies and leave the instrument dimmer control disconnected and check if fuse still blows.
Disconnect the plug near each of the light assemblies to see if any of the individual assemblies is causing the fault. With all light assemblies disconnected and fuse continues to fail, then the fault must be in the main wiring loom some where.
If you have a Multimeter, it could be used to determine which light assembly has a fault between the lamp supply and earth connection.
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