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Discussion Starter #1
I have a '03 2500HD and I am trying to wire up an EGT guage for both power and lighting. The problem I am having is where and how to hook to power and the interior dash lighting. On the '03 they changed the fuse type and it will not allow a blade fuse tap to be inserted with the fuse.


Is there an accessory wiring harness that plugs in near the dash, or does someone have access to the wiring diagrams so I can tap into the correct wires?


Other suggestions would be helpfull.


Thanks!
 

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For the dash/dimmer lead:


According to my GM computer service manual, you could access a dimming wire on the back of the headlight switch.
Pin # is 14.
Wire color is BRN/WHT
Circut # is 230
Function is Instrument Panel Lamps Dimming Control

Looking at the face of the plug that goes into the headlight switch, with the lock catch at the top, it would be the bottom right wire.



For the power lead I believe I tapped into the IGN 1 fuse. Would have to look again to make sure.
 
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