same here
Battery Relocation: Causing Problems?
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Battery Relocation: Causing Problems?
I relocated my battery to the rear a few years ago. I made a bunch of other changes at the time (stroker motor & turbo kit) so it's hard to tell if the symptom is due to the relocation but I wanted to see if I'm missing something. The car has a stutter to it. Cruising around at low RPM's it feels like it's missing intermittently. Also it needs to be started twice most times, there's no spark the first time, turn it off and back on and it starts. I've done a bunch of investigation into coils, injectors, cam sensor, etc. But for the purposes of this thread I want to make sure I didn't alter the electrical charging system somehow that could cause these or any other problems.
Battery is in the rear compartment. The negative from the battery grounds to the frame behind the rear passenger wheel well. The positive wire from the battery runs up through the rocker panel to the engine fuse box. There is another wire from the fuse box to the alternator. The wire to the starter is from the stock loom which I guess goes to the underhoos fuse box as well. There is a ground wire from the frame near the fusebox to the rear of the passenger head.
Battery is in the rear compartment. The negative from the battery grounds to the frame behind the rear passenger wheel well. The positive wire from the battery runs up through the rocker panel to the engine fuse box. There is another wire from the fuse box to the alternator. The wire to the starter is from the stock loom which I guess goes to the underhoos fuse box as well. There is a ground wire from the frame near the fusebox to the rear of the passenger head.
Last edited by 5 Liter Eater; Jul 31, 2013 at 02:16 PM.
Burning Brakes
Joined: May 2007
Posts: 965
Likes: 13
From: turn 12 at Road America or TX
I would emulate the battery wiring on the Z06 which (I think) has the battery in the RH rear - you may have introduced some kind of a ground loop problem with the additional ground wire mentioned in the last sentence. Are you seeing any error codes - even ones that do not show a light?
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
You said you are using the stock battery wiring loom?
I would run a 0awg positive wire from the battery to a distrobution block, mount that below the cabin filter access. 2awg to the starter and a 2awg fuse box.
Remove the factory battery harness and make a 0awg ground upfront from frame to engine.
-Carl
I would run a 0awg positive wire from the battery to a distrobution block, mount that below the cabin filter access. 2awg to the starter and a 2awg fuse box.
Remove the factory battery harness and make a 0awg ground upfront from frame to engine.
-Carl
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
I relocated my battery to the rear a few years ago. I made a bunch of other changes at the time (stroker motor & turbo kit) so it's hard to tell if the symptom is due to the relocation but I wanted to see if I'm missing something. The car has a stutter to it. Cruising around at low RPM's it feels like it's missing intermittently. Also it needs to be started twice most times, there's no spark the first time, turn it off and back on and it starts. I've done a bunch of investigation into coils, injectors, cam sensor, etc. But for the purposes of this thread I want to make sure I didn't alter the electrical charging system somehow that could cause these or any other problems.
Battery is in the rear compartment. The negative from the battery grounds to the frame behind the rear passenger wheel well. The positive wire from the battery runs up through the rocker panel to the engine fuse box. There is another wire from the fuse box to the alternator. The wire to the starter is from the stock loom which I guess goes to the underhoos fuse box as well. There is a ground wire from the frame near the fusebox to the rear of the passenger head.
Battery is in the rear compartment. The negative from the battery grounds to the frame behind the rear passenger wheel well. The positive wire from the battery runs up through the rocker panel to the engine fuse box. There is another wire from the fuse box to the alternator. The wire to the starter is from the stock loom which I guess goes to the underhoos fuse box as well. There is a ground wire from the frame near the fusebox to the rear of the passenger head.
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Carl, the only thing stock is the starter wire. I think it comes out if the fuse box, into the wiring harness and to the starter. All other wires are newly installed 0 GA.
Dennis, the fuel pumps are run off a Racetronix harness from the alternator. It just uses the stock wiring as a trigger. I don't see any fluctuation in fuel pressure when the stutters happen. The stutters are real quick which makes me think coil or injector and I was thinking that there may be a ground problem. I probed the coils and I get a full 12V between the outside wires of all the coil connectors.
Dennis, the fuel pumps are run off a Racetronix harness from the alternator. It just uses the stock wiring as a trigger. I don't see any fluctuation in fuel pressure when the stutters happen. The stutters are real quick which makes me think coil or injector and I was thinking that there may be a ground problem. I probed the coils and I get a full 12V between the outside wires of all the coil connectors.
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Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Seems pretty unlikely. The double starting only happened after I put the (first) stoker in. I keep coming back to maybe something with the double roller timing set, even though both strokers had different timing sets. I have a Casper cam sensor extenstion coming and I'm going to try using the dummy cam sensor I have installed in the back of the iron block just to see.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Seems pretty unlikely. The double starting only happened after I put the (first) stoker in. I keep coming back to maybe something with the double roller timing set, even though both strokers had different timing sets. I have a Casper cam sensor extenstion coming and I'm going to try using the dummy cam sensor I have installed in the back of the iron block just to see.
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Got "high battery voltage" three times on the way to work this morning. Voltage spiked to ~17V for ~10 seconds and then came back down to normal. Did this three times. Yay, another gremlin.
