It's all part of the grounding system. Ecm and tcm electronics can be sensative to grounding issues. While immature that missing ground isn't affecting anything they were out there for a reason could simply be redundancy

 

After I replaced my degraded straps I did some research on why an exhaust pipe is grounded. The two most common answers were: 1- As air moves over the heated pipe quickly it creates static electricity and the ground strap disperses it. 2- A hot exhaust pipe can create RFI (radio frequency interference) and once again the strap disperses it.
Does not having them cause a real issue? Who really knows. All I know is, if the engineers determined it was required, then that's good enough for me. It's not expensive or hard to do.

 

I do have the replacement straps I'm going to put them on I am just curious as to why is all. oddly enough I have no radio interference at all. since my new battery my resting voltage seems a steady 12.6 too, not that that makes a difference.

 

I would actually think that one reason could be to help disperse grounding to the chassis. It's otherwise only really connected to the engine via the manifolds, so while there are a few grounds between the engine and chassis directly, the exhaust pipe could easily serve as another conduit in which to offer a grounding path between engine and chassis. I've never heard of air traveling over metal to create static electricity, but I suppose that it's possible. Certainly an interesting answer! :nerd:

 

In your grandaddy's day, motor vehicle had chains / straps to conduct static to the road / ground.
Then tyres that conduct static to the road came along.

Apparently you can still buy them.
https://www.google.com/url?sa=i&url...375000&source=images&cd=vfe&ved=2ahUKEwjcxaO_2JbyAhVL_4UKHapNAe0Qr4kDegUIARC2Ag

https://www.google.com/url?sa=i&url...375000&source=images&cd=vfe&ved=2ahUKEwjcxaO_2JbyAhVL_4UKHapNAe0Qr4kDegUIARC4Ag

 

Where are these ground straps please?

 

Just past the last cat and and ahead of the muffler, I think? lol been a while since I looked. Kinda midway on the transmission area. When the original owner put the magnaflow catback exhaust on it I assume that's when it disappeared. Wasn't untill last november I noticed the remnants of it so I checked out the ground thread and noticed it.

 

I never even considered grounding the exhaust but it does make sense with the O2 sensors and having just done a cat back I have a perfect clamp nut to do so to.

Thanks for the post and tip!

 

O2 sensors work on an extremely small current. Good electrical connection is essential.

 

Here ya go... Google these terms to see that it is a STRAP-RADIO NOISE SUPPRESSION with part number 56038499AC

 

Thanks Double

 

Not sure if this is a WJ as picture quality is poor, but it looks like one -

- the perils of static.

In the dim and distant past I used to refuel aircraft as a part time job and before filling we always used an earth strap to remove static, so I guess metal moving through air does set up static charges.

 

An interesting point Hampy, thanks.

 

Double E is correct. Mopar says it's a radio noise suppression strap. The picture of the strap matches exactly what mine looks like. Looks like a lot of us here have learned something new. :grin2:

 

Well how about that. Good thing I replaced mine when I was reinstalling my exhaust, as it was broken. It's probably an often broken item. I went with aftermarket strap, but it'll do.

 

Had to get an ac Delco and a Dorman strap. The ground write up only lists the Dorman for the long one and uni made the shorty from the leftover but I didn't have the left over so I hope the ac Delco shorty 1 works I'm sure it will.

 

A ground strap is a ground strap, I just make own, It will be fine you got it!

 

Thanks Wyo, excellent advice, and succinctly put thanks.
I also wanted to see if I had the original strap, and what it looked like.

Just nosey I suppose.

 

It was probably grounding through the system. However time and corrosion tend to deteriorate the connections, hence the current problem.

 

Nah my jeep is clean. It was clearly either torn off or cut to put the cat back exhaust on, was butchered in there too as i have had to have it repaired once for that reason.

 

All fixed. Took the time to clean all the grounds I should have cleaned while my engine was out plus all the power connections as well. Probably would have been a ton easier but what fun would that be right?

 

Also good practice to coat it in some dialectric grease. This will put a little protection on bare grounds

 

Went for a small drive and checked my elcheapo cigarette lighter volt Guage, whether its accurat or not idk but based off that number it's resting at 12.8 not 12.6. I'd call that a win.

 

There's little difference between my cheapo faglighter voltmeter and my calibrated multimeter Xc
It shows somewhere between 13.v & 14v when driving.

 

This was posted a while ago, thought it was amazing. Not sure if you have seen it before:
https://www.jeepforum.com/forum/f310/jeep-wj-ground-write-up-info-4192594/

 

Air flow, over or through metal or plastic will create, Static Electricity, in some cases, more so in cooler temperatures. wood factories, using pipe to move dust particles and small scrap, away from the machines, to compost use long lengths, of ground wire on pipes to bleed S.E. Aircraft, in flight develop S. E. and need to be grounded, before refuel or loading munitions as a precaution. Getting in and out of your vehicle in cold weather while refueling, or filling a gas can, while still in the truck bed. can cause S. E. and be a major fire hazard. on and on, you either have a good ground, or you can become the ground