Size of wire?? - Page 2

NewHemi · 05-07-2010, 08:30 PM

And depending on your computer(if using one in your car), if everything is chassis grounded, you will have nasty litle transient spikes all over the place..

Chassis ground what isn't sensitive and set up a separate ground with out chassi interference.

If you arent using a computer in the car, just chassis ground everything with good heavy ground wire.

David
The New Hemi Guy.

bdixon · 05-07-2010, 10:26 PM

wow thanks for all the great input now i think i need to rethink some of my wiring...... thanks to all bryan

Kegracing · 05-08-2010, 08:09 AM

Bryan,

Just to be clear on the relay's. You still need a large wire on the main power into the relay and out to the pump. I use 10 or 12 ga. depending on length of run, on the cars I wire. You can then use 14 16 ga on the switch wires. I use relays on the fuel pump, water pump, and electric fan. I also put fuses on everything. Some like circuit breakers, I like simple with fuses.

Also, as several have said, make sure you ground everything. I probably over kill this, but I use ground straps on the heads to block on alum head combo's, block to frame/cage. I chased a grounding issue on a car years ago, and swore to never miss that step again!

Good luck.

Ken

FED 387 · 05-08-2010, 09:42 AM

as far as grounding straps go USE THE BRAIDED STUFF- do not use solid core

rayfin · 05-10-2010, 12:28 AM

Define juice? A wire twice as big in diameter will have 1/2 as much resistance or twice the conductance. See OHMS LAW.

http://en.wikipedia.org/wiki/Ohm's_l...of_Ohm.27s_law

Basically voltage = current times resistance or current = voltage divided by resistance. Resistance is measured in ohms.

NewHemi · 05-11-2010, 08:12 AM

OHMS law???

That has been our problem, we have been using "Murphy's law" all this time!

David
The New Hemi Guy

05-07-2010, 08:30 PM	#11
NewHemi Senior Member Join Date: Dec 2009 Location: Ohio Posts: 472 Likes: 0 Liked 1 Time in 1 Post	Re: Size of wire?? And depending on your computer(if using one in your car), if everything is chassis grounded, you will have nasty litle transient spikes all over the place.. Chassis ground what isn't sensitive and set up a separate ground with out chassi interference. If you arent using a computer in the car, just chassis ground everything with good heavy ground wire. David The New Hemi Guy.

05-07-2010, 10:26 PM	#12
bdixon Member Join Date: Dec 2009 Location: mitchell sd Posts: 289 Likes: 4 Liked 15 Times in 7 Posts	Re: Size of wire?? wow thanks for all the great input now i think i need to rethink some of my wiring...... thanks to all bryan

05-08-2010, 08:09 AM	#13
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: Size of wire?? Bryan, Just to be clear on the relay's. You still need a large wire on the main power into the relay and out to the pump. I use 10 or 12 ga. depending on length of run, on the cars I wire. You can then use 14 16 ga on the switch wires. I use relays on the fuel pump, water pump, and electric fan. I also put fuses on everything. Some like circuit breakers, I like simple with fuses. Also, as several have said, make sure you ground everything. I probably over kill this, but I use ground straps on the heads to block on alum head combo's, block to frame/cage. I chased a grounding issue on a car years ago, and swore to never miss that step again! Good luck. Ken

05-08-2010, 09:42 AM	#14
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,400 Likes: 482 Liked 320 Times in 172 Posts	Re: Size of wire?? as far as grounding straps go USE THE BRAIDED STUFF- do not use solid core

05-10-2010, 12:28 AM	#15
rayfin Member Join Date: Mar 2009 Location: sioux city Posts: 134 Likes: 1 Liked 0 Times in 0 Posts	Re: Size of wire?? Define juice? A wire twice as big in diameter will have 1/2 as much resistance or twice the conductance. See OHMS LAW. http://en.wikipedia.org/wiki/Ohm's_l...of_Ohm.27s_law Basically voltage = current times resistance or current = voltage divided by resistance. Resistance is measured in ohms.

05-11-2010, 08:12 AM	#16
NewHemi Senior Member Join Date: Dec 2009 Location: Ohio Posts: 472 Likes: 0 Liked 1 Time in 1 Post	Re: Size of wire?? OHMS law??? That has been our problem, we have been using *"Murphy's law"* all this time! David The New Hemi Guy