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Old 09-18-2012, 03:36 AM   #1
Scooby Newbie
Member#: 291604
Join Date: Aug 2011
Chapter/Region: TXIC
Location: Houston
Default Please Help! - Illumination Fuse Keeps Blowing

So tonight my friend hooked up my gauges for me. Boost/Oil Temp/EGT if it matters, but during installation 2 of the wires touched and the AC lights/illumination ended up flickering on and off really quick.

I checked the fuse and it was blown so I replaced it with another 10A fuse and it blew again as I turned it on. I'm positive it has something to do with the wiring of the gauges, but I don't know how to figure out EXACTLY what it is. I'm terrible with electrical problems.

Any ideas as to what is wrong?
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Old 09-18-2012, 06:26 PM   #2
Scooby Guru
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
2001 LL Bean Outback


Well you have a short to ground on the illumination circuit in case you didn't know that already. An easy thing to do when trying to find the short is to disconnect suspected trouble areas from the power circuit and see if the problem clears. Since changes were made to the illumination circuit for the new gauges then the logical thing to do would be to disconnect the wiring to the new addition and see if that clears the trouble. I suspect it will.

You have to be careful when connecting additional lights to the illumination circuit. One side of the circuit is hot but the return side of the circuit doesn't tie directly to ground like a normal light would. The lamp intensity is changed via the illumination control module that is located in the return side of the circuit and mounted under the dash. The dimmer control basically changes the resistance to ground for the lights through the module so that makes the lights change intensity. Hopefully the module didn't get damaged when the wire short happened but that may be the case here. If disconnecting the new gauges doesn't clear the short then disconnect the module and see if that does. If the short clears then you probably will need to replace the module.
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