Don't need an EMP to screw with electronics..

[mikez71]

Just saw this bulletin for fiberglass vans, where the wheel speed sensors glitch going under power lines, which screws with the ebcm..
It even shows voltage spikes/dips measured at the battery. I can't see the scale, but it looks like +/- 2V.
Has something to do with roof bows, I wonder if the spacing is critical. So they ground the bows with straps.
I wonder if the SSV's had bonding straps because of problems with radio equipment since all the wiring seems to cater to that.. (or lights)...

https://www.gmupfitter.com/wp-content/uploads/2025/10/UI-Bulletin-206_Information-on-Hesitation-and-or-Misfire-Sensation-When-Passing-Under-High-Voltage-Transmission-Power-Lines.pdf

 

[Marky Dissod]

GM always added extra grounding straps & interference-reducing measures to PPVs & SSVs, but did not bother doing so for civilian vehicles,
ostensibly to save a few bucks per vehicle assembled.

 

[Doubeleive]

just more proof that adding grounds "won't hurt", some will disagree and say it does nothing, yet here we are.

 

[mikez71]

Yep.. and I guess these are technically "bonding" straps.
I had to look it up, but if anything it potentially helps with ground loop problems.

Extra battery grounds maybe technically another ground? Not implying that it would induce a ground loop issue.
My assumption is that ground loops typically happen to something NOT grounded well to the battery, and having to go through a poorly grounded body part..

Got these 8" Napa 710899 straps on ebay (1 auction, sorry you'll have to find another seller).
They look like a better braid and crimp than the amazon stuff..

But not as nice looking as the 9" GM straps. (AI-10-0021REVA Ground Strap - which I can't find)

https://www.gmupfitter.com/wp-content/uploads/2021/07/UI-Bulletin_173b-1.pdf