Battery Reloc. No power to ecm?
12-24-2006 | 11:27 PM
#1
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Battery Reloc. No power to ecm?
Hey everybody merry christmas!
I have a problem.I just did a batery relocate on the camaro tonight and now I don't seem to have any power to the ecm.When I turn the key on my check engine light doesn't even blink.when I jumped the a and b ports I got nothing as well.The will turn over but ofcourse it won't start.Do I not have a ground set up right? Here's a few pics of what I have done.Tell me if you see something wrong.Any help would be great.
I have a problem.I just did a batery relocate on the camaro tonight and now I don't seem to have any power to the ecm.When I turn the key on my check engine light doesn't even blink.when I jumped the a and b ports I got nothing as well.The will turn over but ofcourse it won't start.Do I not have a ground set up right? Here's a few pics of what I have done.Tell me if you see something wrong.Any help would be great.
12-24-2006 | 11:28 PM
#2
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Last ones.Please help me guys,thanx.
12-24-2006 | 11:31 PM
#3
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
ok these are the last ones.
12-24-2006 | 11:39 PM
#4
Joined: Mar 2000
Posts: 5,680
Likes: 114
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Check thefuel pump fuse, thet little black fuse holder under the hood.
It also supplies battery power to the ECM.
Did you also reconnect the wire from the ALT. to the little wire on the battery cable?
It also supplies battery power to the ECM.
Did you also reconnect the wire from the ALT. to the little wire on the battery cable?
12-24-2006 | 11:44 PM
#5
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
which wire do you mean? I checked the fuel pump fuse and it's still good.
12-25-2006 | 01:19 AM
#6
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
the wire from the alt runs to the starter like it always has.
12-25-2006 | 03:10 AM
#7
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Would I have to run a wire from the starter to this location?That's basically how it was when the battery was up front,coming from the positive terminal from the starter to here.
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12-25-2006 | 10:44 AM
#9
Junior Member
Joined: Oct 2004
Posts: 68
Likes: 0
From: Kentucky
Car: 92 RS/ 87 T/A
Engine: 305/L98
Transmission: 700R/700R
Axle/Gears: 3.42 Posi/3.27 Posi
Vader is exactly right i had the same fuse blow on my 87 T/A like to never have found it i was having the same probs that you was get power to that inline fuse and she should start right up
12-25-2006 | 04:58 PM
#10
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Problem solved.I needed to hook up the wire to the starter to the ground by the radiator.thanks for the help guys.
12-25-2006 | 06:25 PM
#11
Supreme Member
Joined: Jan 2003
Posts: 2,133
Likes: 2
From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
One is Battery power, the other is Ignition power and Ground is through the starter housing to the block through the frame/firewall ground straps back to the battery.
Somebody please tell me what's going on here???
12-25-2006 | 07:16 PM
#12
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
I needed a wire to get power to the ecm.Refer to the third pic in post 2 to the pic in the 7th post of this discussion for an idea as to what I'm talking about.When the battery is hooked up in it's regular spot in the engine bay the Battery to starter cable has a little red wire coming off of it and it is bolted to the little post next the the radiator.My belief is that this ground along with the other wires hooked is where the ecm gets it's power from the battery and the alt.When I moved my battery I didn't have a hot wire running to that post so what I had to do was tie it in with the positive cable from the battery off the starter .the post is more than long enough to have everything bolted to it.I hope this makes sense.
12-26-2006 | 02:34 AM
#13
Supreme Member
Joined: Jan 2003
Posts: 2,133
Likes: 2
From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
I needed a wire to get power to the ecm...Refer to the third pic in post 2 to the pic in the 7th post of this discussion for an idea as to what I'm talking about. When the battery is hooked up in it's regular spot in the engine bay the Battery to starter cable has a little red wire coming off of it and it is bolted to the little post next the the radiator. My belief is that this ground along with the other wires hooked is where the ecm gets it's power from the battery and the alt. When I moved my battery I didn't have a hot wire running to that post so what I had to do was tie it in with the positive cable from the battery off the starter, the post is more than long enough to have everything bolted to it. I hope this makes sense.
...When the battery is hooked up in it's regular spot in the engine bay the Battery to starter cable has a little red wire coming off of it and it is bolted to the little post next the the radiator...
My belief is that "this ground" along with the other wires hooked is where the ecm gets it's "power" from the battery and the alt.
It is without a doubt a 12v distribution terminal.
Since it worked for you, I hate to think someone would be tempted to use it as a ground.
12-26-2006 | 01:21 PM
#14
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Ok thanks for the clarification.Sorry my wording isn't the greatest when I have my rugrats pulling at me to pull bubble gum out of their hair.LOL
12-26-2006 | 01:40 PM
#15
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12-26-2006 | 10:31 PM
#16
Joined: Feb 2006
Posts: 1,547
Likes: 0
From: 39.84N 105.11W
Car: '89 Trans Am GTA
Engine: WAS 350 - now L92 (alum. 378/6.2L)
Transmission: WAS 700R4, now a built T56
Axle/Gears: 3.27 9-bolt
Sweet, I'm really glad that you posted this question, since I've got a battery relocation setup also - and the only reason I haven't done anything with it is that I saw that smaller wire coming off the positive terminal, & thought 
...
...
12-28-2006 | 09:40 AM
#17
Senior Member
Joined: Jan 2006
Posts: 720
Likes: 1
From: League City, TX
Car: 90 Formula -- tot resto in progress
Engine: 350
Transmission: 700R4 w/ 2500 stall, by Owen @ ARD
Axle/Gears: 3.23 posi disc
All's well that end's well.
To summarize...
I don't pretend to understand it, but on these vehicles, power
distribution is split between an additional connection on the main
battery terminal at the starter solenoid, and the smaller junction
block near the radiator. (On my Formula, this block was under
the battery tray, and subject to corrosion that led to charging
failure. Tail-chasing for about a week on that one.)
To summarize...
I don't pretend to understand it, but on these vehicles, power
distribution is split between an additional connection on the main
battery terminal at the starter solenoid, and the smaller junction
block near the radiator. (On my Formula, this block was under
the battery tray, and subject to corrosion that led to charging
failure. Tail-chasing for about a week on that one.)
12-31-2006 | 03:30 PM
#18
Junior Member
Joined: Dec 2006
Posts: 10
Likes: 0
is it the two square boxs on the side there? those are the only two things i see that may resemble a fuse. I am having the same problem. (not from a battery location its from my starter change in the other post) but i was reading this and i have the same symptoms now. I have spark, and it turns over but no start. and the check engine light does not come on when the i put the key in and turn it.
12-31-2006 | 04:16 PM
#19
Thread Starter
Joined: Apr 2004
Posts: 2,960
Likes: 59
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
make sure that there is power to the ecm from the 12v junction point,or check for a blown fuse.
Last edited by robertfrank; 12-31-2006 at 05:17 PM. Reason: spellcheck
12-31-2006 | 04:52 PM
#20
Joined: Mar 2000
Posts: 5,680
Likes: 114
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
[Would I have to run a wire from the starter to this location?]
Yes...I guess you figured it out.
Yes...I guess you figured it out.
01-01-2007 | 07:06 AM
#21
Supreme Member
Joined: Jan 2003
Posts: 2,133
Likes: 2
From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
is it the two square boxs on the side there? those are the only two things i see that may resemble a fuse. I am having the same problem. (not from a battery location its from my starter change in the other post) but i was reading this and i have the same symptoms now. I have spark, and it turns over but no start. and the check engine light does not come on when the i put the key in and turn it.
01-01-2007 | 09:16 PM
#22
Junior Member
Joined: Dec 2006
Posts: 10
Likes: 0
found it and everything is up and runnin again. Turns out the guy that i bout it from about 5 years ago did a bunch of jerry rigging when he tried modifying stuff. So the fuse was actually near the battery for some reason. But i found it and it solved the problems. Now im just hoping my alternator isnt fried from the other problems. Ive driven it a few times. prolly a total of 10 miles and had electric current running through it and it has stayed at around 12 volts, but at the same time when i rev the engine it dosent go up either.
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