I currently own a 2006 Hummer H1 Alhpa and I am having Electrical Problems.

1. When I start the engine all of the LED lights on the dashboard turn on
and the Electrical output is 10V.

2. I have found out that when I take out the No.9 redwire hooked up to the
Oil Pressure & Temperature Panel, the output goes up to 14V and all
of the Led lights turn off but if the red wire is unhooked the Led lights
on the Oil Pressure & Temperature Panel will not turn on.

I believe there is some other problem causing this matter, But I do not
have any Electrical Diagrams or manuals to follow.

In Japan it is very difficult to receive any technical advise.
Your help will be most appreciated.

 

I really wish I could help..But it is a warranty item, the dealer you bought it from will fix it...Other than that if you bought your H1 some other way..and you have no dealer around you (Makes sense in the land of Toyota a HUMMER that you wouldn't have a dealership, becuase that would be a real stand up for what you want statement)...But it sounds to me that you have a short in that gauge cluster, dragging down the whole system..If you can replace that gauge set/panel only, that's what I'd do.