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help with amp install


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dazza 
Member - Posts: 1
Member spacespace
Joined: July 07, 2004
Location: New Zealand
Posted: July 07, 2004 at 1:16 AM / IP Logged  

Just run rca's and cabling for a Sony 200W amp. The amp has been bridged and is running a Cerwin Vega 12"sub.  The source is a JVC single disc head unit. When the remote, earth & power cables are connected to the amp the amp will not turn on.  The 3 cables from the amp run into a female plastic quick connect joint which joins with a male one from the source.  I have tested the supply plug - when the head unit is on i get about 10-11V from the remote lead & 12-12.5 from the battery, all with repect to the earth.  The earth is run to the car chassis.When the supply plug is connected to the plug from the amp nothing turns on.  Testing the voltage at the terminals at the amp only gives about 3Volts - probably the reason why is doesn't go.  But when the cables are disconnected from the amp they all read about right again.  I have bypassed the voltage supply from the car with an external battery.  Connecting the power and earth from the amp to the battery, but still using the remote turn on supply from the head unit to turn the amp on - and this works! Can any body help me out! - why won't the amp turn on when the supply cables from the car is connected to the amp!. Note the car has just got a new battery

aidipf 
Member - Posts: 23
Member spacespace
Joined: April 14, 2003
Location: United States
Posted: July 07, 2004 at 2:00 PM / IP Logged  
only suggestion is to check your cable runs and where you're actually accessing the 12 volts from on the battery
mr. innovations
DYohn 
Moderator - Posts: 10,741
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: July 07, 2004 at 2:09 PM / IP Logged  
Yes, I agree, run your power for the amp straight to the battery (with the proper fuse) and ensure your ground is to bare metal on the chassis.  Does the amp run with the engine running?  If so, I would suspect your battery has a bad cell.
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