How do i ground my 5.3???
02-25-2015, 06:42 PM
#1
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How do i ground my 5.3??? I am not getting any spark on my 5.3 that I swapped into my foxbody. I have the pcm harness grounds on the back of the driver cylinder head as per BP, 4awg from the passenger cylinder head to chassis, and 4awg from bat. to chassis. any help would be greatly appreciated.
02-25-2015, 07:10 PM
#2
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Is the battery in the trunk?
I have had numerous issues in the past by grounding the way that you are. I would recommend running a 2ga ground wire from the battery negative terminal all the way up to the block of the engine.
I had weird cranking issues on my ford when I first got it done, acting like the truck had a low battery. Ran the 2 ga welding cable from the battery up to the motor and cleaned all the paint off all the grounds and it has been problem free since then.
Clean secure grounds are important.
Sean
I have had numerous issues in the past by grounding the way that you are. I would recommend running a 2ga ground wire from the battery negative terminal all the way up to the block of the engine.
I had weird cranking issues on my ford when I first got it done, acting like the truck had a low battery. Ran the 2 ga welding cable from the battery up to the motor and cleaned all the paint off all the grounds and it has been problem free since then.
Clean secure grounds are important.
Sean
02-25-2015, 07:47 PM
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and no, my battery is not in the trunk its in the bay...
02-25-2015, 07:56 PM
#7
is it a factory harness or aftermarket? Factory harnesses have one that comes out right below where the coolant temp sensor comes out of the harness, and hooks to the block.
Also, make sure the crank sensor is plugged in, it's behind the starter and is kind of hard to see.
Also, make sure the crank sensor is plugged in, it's behind the starter and is kind of hard to see.
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02-25-2015, 08:18 PM
#8
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aftermarket harness. im just going to run a 4awg from the racks to the chassis. crank sensor is plugged in it may be bad who knows. all I know is im not getting spark so I chalk it up to bad grounds right now...
02-26-2015, 04:16 AM
#10
Generally the valve covers are isolated from ground because of the valve cover gaskets. That said, the coil brackets dont need to be grounded. The wire you say you have hooked to the rack, is that an engine harness wire, or an original fox body wire?. If its an LS engine harness wire, I would hook it to the block and make sure the connection is good. If that doesnt work, I would call whoever made the harness. Its hard to say how an aftermarket harness could be laid out, it's probably different than a factory harness.
Last edited by ls1nova71; 02-26-2015 at 05:11 AM.
02-26-2015, 11:48 PM
#12
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I added a second ground to one of the coil bracket studs on my car. It made a huge difference in cranking speed and charging system output. The cover itself may be isolated but the bolts can carry a significant load.
