big daddy cow

Hi I have a 1997 Tahoe 5.7. Recently my tachometer, speedometer and shifting gauge stopped working, as well I have noticed that my transmission isn't going into first gear in drive unless I manually put it in 1st.


I have taken into a trust mechanic, and he stated that it is my ball body, the solenoids. Now I know that can be an issue, if the transmission is the only issue. I have gone through a few other forums and read that it can be my ignition switch.


I had the codes checked out, P0740, P0753, P0758,P1860, and P0785 were being shown. I also checked the fuse box and noticed that #20 didn't have any current flow but wasn't blown. I have replaced it.


I also have already looked at the wiring to the ignition switch and all are showing current flow except for the purple wire in the middle. I need to know if this can still be the issue or should I be looking at something else. Or is there another way to check the power to the ignition switch.


Please Help!




Thank you in advance

in2pro

Welcome to the forum...
Looks like you are on the right track about the purple wire..
see attached PDF

big daddy cow

thank you


do you think it sounds like the ignition switch after all.
i don't know what else to look at.

in2pro

I'd at least check fuse #8 in the IP fuse block that it indicates in the diagram...

big daddy cow

ok.




After I check fuse #8 and what does it mean if it happens to be like #20 and #14. where its not blown but no current. what should i be looking at