1998 GMC Other

Electrical problem
1998 Other GMC Models V8 Four Wheel Drive Automatic? Miles

My 1998 Suburban has been having this problem for about a week whenever my headlights are on the blinkers dont work but they work fine when the headlights are off any suggestions on what the problem might be? Also now when my blinker is on my digital clock and radio lights in the truck blink along with the blinker and that didnt happen before either.
August 13, 2008.

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