Possible Ign Or Other Wiring Problem? '03 Yukon 5.3l Flex, 160k

[yukonstein]

I originally posted this under A/V and Electrical but this may be a better place to post.

 

My wife started the truck today, and phoned me to say the ABS and brake warning lights were on. She could feel no difference with the brake pedal so she carefully drove home. Along the way she realized the digital temp and compass display in the RV mirror were out, and the AC was blowing warm. She stopped and turned the truck off, then started it again. All warning lights went through the normal start-up sequence, the mirror display came on, and the AC blew cold. No more brake or ABS warning.

 

When she came home I had her stop and start the truck again so I could watch. Nothing unusual. At idle the battery guage went from just shy of the halfway mark to sitting just on the high side of the halfway mark (isn't that really the alternator guage?). All other guages appeared normal. We turned climate control off then on again. I could hear the AC kick in just like normal. I expected some movement in the battery guage with the extra load but really didn't see any.

 

Is what my wife noticed when she started the truck for the first time an early indication of trouble in the ingnition wiring, the fuse or relay panel, or something else?

 

Thanks.

[[email protected]]

I originally posted this under A/V and Electrical but this may be a better place to post.

 

My wife started the truck today, and phoned me to say the ABS and brake warning lights were on. She could feel no difference with the brake pedal so she carefully drove home. Along the way she realized the digital temp and compass display in the RV mirror were out, and the AC was blowing warm. She stopped and turned the truck off, then started it again. All warning lights went through the normal start-up sequence, the mirror display came on, and the AC blew cold. No more brake or ABS warning.

 

When she came home I had her stop and start the truck again so I could watch. Nothing unusual. At idle the battery guage went from just shy of the halfway mark to sitting just on the high side of the halfway mark (isn't that really the alternator guage?). All other guages appeared normal. We turned climate control off then on again. I could hear the AC kick in just like normal. I expected some movement in the battery guage with the extra load but really didn't see any.

 

Is what my wife noticed when she started the truck for the first time an early indication of trouble in the ingnition wiring, the fuse or relay panel, or something else?

 

Thanks.

 

Unless it happens again, I wouldn't worry about it. My truck has did that before, all the gauges went crazy, but has not ever did it since. Probably just a class 2 data glitch, it happens. The brake and abs light on sound like you need to check your front hubs and speed sensors for corrosion and whatnot, and maybe even look into the known ground issue.

[yukonstein]

Thanks, Silverado364. I'l just have her keep an eye on it.

 

There's a known ground issue?

[[email protected]]

Yeah with the ABS controller (EBCM). If you look right under the truck on the left outside of the chassis. If you look at that body mount on the left front you'll see many wires bolted to the chassis in that spot. It's a known corrosion spot, most people take out the bolts sand the contact spot down and replace bolts(very tightly).

[yukonstein]

Yeah with the ABS controller (EBCM). If you look right under the truck on the left outside of the chassis. If you look at that body mount on the left front you'll see many wires bolted to the chassis in that spot. It's a known corrosion spot, most people take out the bolts sand the contact spot down and replace bolts(very tightly).

 

 

Huh! That's good to know. I'm going out right now to check it.

Many thanks!