Instrument cluster has lost it's mind....

[Ben Burrage]

bad ground...

 

[Chilledspode]

Still chasing things and I hear you on the bad ground - thank you. There is something in the headlight switch - if I tap the leftend of the dash near the headlight switch things get goofy and the dome light dimmer is interacting with the gauges as well. Going to replace the switch and then see what I have left over to deal with. Stay tuned...

 

[Ben Burrage]

there are several grounds going down the driver side frame rail. clean every one of them, including one behind fuel hose behind fuel cap. also several at the rear tail lights behind the rear bumper. one near starter on passenger side frame rail. and i recommend adding heavy gauge ground at negative battery terminal.

 

[Chilledspode]

Behind the fuel cap ?! - nicely done, thank you for that gem and the others....

 

[Chilledspode]

there are several grounds going down the driver side frame rail. clean every one of them, including one behind fuel hose behind fuel cap. also several at the rear tail lights behind the rear bumper. one near starter on passenger side frame rail. and i recommend adding heavy gauge ground at negative battery terminal.

The ground from the negative battery terminal - I assume to the frame/chassis vs body. Thanks

 

[Chilledspode]

Classic! Two ground issues, one at the data port and one at the blower motor. Plugging a scan tool in would bridge the grounds and make everything work properly - until you unplugged it... My thanks to the guys at the shop who solved what I could not understand. Cheers

 

[5vortec7]

Shameless plug, if needed. Have one ready to go...

https://www.gmt400.com/threads/big-3-and-dual-battery-kits.41818/

 

[Chilledspode]

Shameless plug, if needed. Have one ready to go...

https://www.gmt400.com/threads/big-3-and-dual-battery-kits.41818/

Nice stuff! Will be in touch for one of these kits shortly. Thanks for letting me know about it.

 

[89RCLB]

Glad to hear that you got it sorted out, bad grounds can cause all sorts of funky issues.