I took the one out of my 02 HD Chevy truck and put it in my 03 Chevy truck and the light stays on.
Controller works fine w/ light on.
I put it in my 03 GMC truck and light is on but haven't pulled my big trailer yet.
So I don't know why light is on but I get home I will look at the blue wire and see what I can find out.
I haven't had time to put the controller out of 02 Suburban in the H2 yet.
Might try to do it Sunday.
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07 White H3 Adventure w/ some black stuff
04.5 GMC D/A CC SLT LB EFI LIVE tuned
98 ZR-2 Blazer
Ex H2&3 owner
My hiking boots and canoe paddle have more miles than most 'offroad' vehicles, over 350 in last year.
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