Ground wire fries - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old Nov 11th, 10, 05:22 PM Thread Starter
Senior Tech
Marc
 
Join Date: Apr 2008
Location: Sacramento
Posts: 384
Ground wire fries

OK, I have a doozy of a problem. I hooked up a sub woofer and amp in the trunk where the battery is. Ran grounds to the neg and power to the positive sides of the battery. My battery (an Optima) ran dead, so I took it out and charged it. I put it back in, and when I attached the cables, a ground wire (coming from the amp to the deck) started to smoke and fry progressively from the amp. Further, when I tried re-attaching the negative cable, it is arcing like crazy and gets hot. What the hell is going on here?? Nothing changed except I took the battery out of the car- otherwise, no electrical changes. I am stumped. BTW, battery read 12 volts, but quickly ran down to 9.5.
SS69Cam is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old Nov 11th, 10, 05:34 PM
Senior Tech
Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: Ground wire fries

The only thing I can think is either a bad amp or the cables were hooked up backwards. This is one reason why you need a fuse right at the postive battery post on your power cable to the amp.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
Steiner is offline  
post #3 of 13 (permalink) Old Nov 11th, 10, 05:38 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,183
Garage
Re: Ground wire fries

It reads like the amp is toast, literally.

Also, I believe, the return wire to the head/deck should not be tied to body/chassis ground, but only to the head/deck unit as the return is isolated from the rest of the car. So when the deck is turned on, a power on command goes to the amp to turn it on elctronically. The power-on command circuit should be isolated, maybe. Read amp installation instructions, might show the circuit.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is offline  
 
post #4 of 13 (permalink) Old Nov 11th, 10, 05:46 PM Thread Starter
Senior Tech
Marc
 
Join Date: Apr 2008
Location: Sacramento
Posts: 384
Re: Ground wire fries

I think you are both right about the amp, but it truly makes no sense as I didn't change anything other than remove the battery for a charge. The ground wire in question was part of the RCA cables from the amp to the deck. I put one end in the ground spot on the amp, and found out that the other end wasn't even connected yet! Why would it fry like that? The power cable from the amp to the battery does have an in line fuse, but its fine. And why the heck all the sparks and heat from the Neg battery cable?
SS69Cam is offline  
post #5 of 13 (permalink) Old Nov 11th, 10, 06:05 PM
Senior Tech
Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: Ground wire fries

The ground in the RCA cables is for noise isolation. You might not even need it connected if you don't pick up interference once you get everything up and running.

Try disconnecting everything from the amp and then hook up just your power and ground cable. At this point however, if the amp is toasted it may still have a problem when you connect power to it.

The ground cable immediately getting hot says that there's a current draw when you try to complete the circuit. That shouldn't be so if your turn on lead from the stereo is off.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
Steiner is offline  
post #6 of 13 (permalink) Old Nov 11th, 10, 06:11 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,183
Garage
Re: Ground wire fries

The ground wire from the RCA cables is for the noise shield of the cable. Only hook one end of the RCA cable ground. Leave the other end of the RCA cable ground disconnected, otherwise a ground loop is made, bad news.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is offline  
post #7 of 13 (permalink) Old Nov 11th, 10, 09:51 PM Thread Starter
Senior Tech
Marc
 
Join Date: Apr 2008
Location: Sacramento
Posts: 384
Re: Ground wire fries

Any thoughts of why the negative battery cable is sparking and getting hot? The cables are not reversed. I am totally baffled. And why did the damn ground wire fry????
SS69Cam is offline  
post #8 of 13 (permalink) Old Nov 11th, 10, 10:00 PM
Senior Tech
Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: Ground wire fries

Do you have a multimeter so you can check from the positive terminal on the amp to the amp case or from the positive terminal to the ground terminal on the amp? Maybe the terminals are mislabeled? What brand and model amp is it?

Ground cable getting hot indicates current draw. That should not happen if the amp is good, amp is off, and cables are correct.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
Steiner is offline  
post #9 of 13 (permalink) Old Nov 12th, 10, 07:34 AM Thread Starter
Senior Tech
Marc
 
Join Date: Apr 2008
Location: Sacramento
Posts: 384
Re: Ground wire fries

I have completely disconnected the amp- which is probably fried anyway. Still neg cable sparking.
SS69Cam is offline  
post #10 of 13 (permalink) Old Nov 12th, 10, 08:29 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,183
Garage
Re: Ground wire fries

If just the cable is hooked up and no amp on the other end, then its the cable/wire or another circuit in the car.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is offline  
post #11 of 13 (permalink) Old Nov 12th, 10, 08:50 AM
Senior Tech
Michael
 
Join Date: Apr 2010
Location: Lutz, FL
Posts: 1,918
Re: Ground wire fries

Start pulling the fuses out of the fuse box one at a time until you find the faulty circuit.

Then start investigating the devices on that circuit.
mahunt is offline  
post #12 of 13 (permalink) Old Nov 12th, 10, 09:23 AM
Gold Lifetime Member
Mickey
 
Moonpie's Avatar
 
Join Date: May 2008
Location: Mesquite Texas
Posts: 2,159
Re: Ground wire fries

Use your meter and take a resistance reading between battery ground and the shell. You may have a less than perfect ground to the body from the battery. Should read under 1 ohm. Check the meter cables to each other first so you know what you're starting with.
Moonpie is offline  
post #13 of 13 (permalink) Old Nov 12th, 10, 12:56 PM Thread Starter
Senior Tech
Marc
 
Join Date: Apr 2008
Location: Sacramento
Posts: 384
Re: Ground wire fries

You know what? I am going to go get an AC Delco battery and forget this nonsense.

Last edited by SS69Cam; Nov 12th, 10 at 01:37 PM.
SS69Cam is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome