fitrider82
NAXJA Forum User
- Location
- MI
Plan on making my own battery cables for all main power and grounds. Can anyone provide the specific lengths, and hole sizes needed when I make them? Plan on going with 2AWG. Thanks!
Plan on making my own battery cables for all main power and grounds. Can anyone provide the specific lengths, and hole sizes needed when I make them? Plan on going with 2AWG. Thanks!
I was going to use this for lengths for my '00 but not sure what year these at this link apply too. If it even makes a difference.
http://www.angelfire.com/my/fan/Power_Cables.html
Instead I scoffed a harness out of the boneyard from a '99, almost positive it is the same as my '00, to use as a guide.
You are the man, hopefully these are the right lengths for my ‘93. The link is much appreciated!
One caution about that link. He craps on the block to firewall connection as being weak as its braided. But it is that way to reduce EMI interference generated by the engine. The shape of that strap is probably that way due to radio engineering. If it were me and mine looked bad I'd replace it with a like style rather than turning it into a round cable.
I just grabbed used some ready-made beefy ones from the local tractor supply house. Otherwise, you'll need to borrow a hydraulic crimper since a poor crimp is worse than undersized cable
No, nothing so elaborate even if the wire construction could affect EMI. I'm pretty sure it was a flat braid simply to maximize the flexibility so it doesn't fatique and break due to motor movement. The downside of the braided is that the strands are more exposed to dust, dirt, abrasive and corrosion. Just use some reasonable sized wire with a high strand count and a little extra length to improve the flexibility and you'll be fine.
cherokeeforums said:RADIO NOISE SUPPRESSION
DESCRIPTION
Radio Frequency Interference (RFI) and Electro-Magnetic Interference (EMI) noise suppression is accomplished primarily through circuitry internal to the radio receivers. These internal suppression devices are only serviced as part of the radio receiver. External suppression devices that are used on this vehicle to control RFI or EMI noise include the following:
· Radio antenna base ground
· Radio receiver chassis ground wire or strap
· Engine-to-body ground strap
· Resistor-type spark plugs
· Radio suppression-type secondary ignition wiring.
The above statement is essentially the same in the 1997 FSM but has the following statement concerning the Engine-to-body ground strap:
“Engine-to-body ground strap (if the vehicle is so equipped)”
The radio receiver chassis ground is located at a ground terminal designated G108, which is located on the instrument panel frame structure near the headlamp switch. The engine-to-body ground strap on the firewall provides a close proximity ground path to the radio recever chassis ground point.
Note that the '97 FSM description differs from the '99 FSM description only that it states "if the vehicle is so equipped". Not that it makes any difference here but apparently there is a posibility that the '97 XJ may not have this strap if there is no radio installed.
Earlier XJ's may not use this ground strap strictly for this purpose.
Braided ground straps sold at Advance Auto Parts, and elsewhere, are suitable for replacement if your ground strap is no good. I think a large gauge cable would be an overkill in this application.
One caution about that link. He craps on the block to firewall connection as being weak as its braided. But it is that way to reduce EMI interference generated by the engine. The shape of that strap is probably that way due to radio engineering. If it were me and mine looked bad I'd replace it with a like style rather than turning it into a round cable.
You are correct, all "lighting protection cable" is braided for a reason! It's not about the shape, just braiding.
All you said is true, but it also applies to DC signals, that's way the O2 sensor wiring is "twisted pair". Any signals that a DC conductor picks-up can be "reduced" by "braided" or "twisted pairs"
Ah, fun, that gets into my line of expertise. Ethernet (read Network) cables work the same way. They are twisted pair to reduce EMI as well. Googling a bit finds this article:
https://www.eetimes.com/document.asp?doc_id=1279624
Apparently twisting the wires causes them to reject an evenly applied interfering EM wave.
EMI and crosstalk. Pushing 350 Mhz and above gets interesting. And the twists in each pair on an Ethernet cable is different in the number of twists per foot. Heck, when you get to Cat 6 stuff, they keep the twists going all the way into the connector. Man, Cat 6 ends are a pain to put on.
David Bricker / SYR
Ah, fun, that gets into my line of expertise. Ethernet (read Network) cables work the same way. They are twisted pair to reduce EMI as well. Googling a bit finds this article:
https://www.eetimes.com/document.asp?doc_id=1279624
Apparently twisting the wires causes them to reject an evenly applied interfering EM wave.