Audio amp parasitic draw

Jj Technician Massachusetts Posted   Latest  
Resolved
Electrical
2002 Chevrolet Suburban 1500 LS 5.3L (Z L59) 4-spd (4L60-E) — 1GNFK16Z22J222673
Battery Draw

Tracking down a draw in this suburban. Come to find a .9mV drop across the RDO AMP fuse under the hood. Lt the truck sit overnight and have a .6A draw at the battery, still .9mV across the amp fuse. Put a low amp probe around the orange power supply to the amp and there's about .45A there after sitting, also it's warm to the touch. I guess this is more of a sanity check, but question is why is it on. Checked the Radio On signal at the amp and it appears to be working. Nothing there key off and 7v key on so I'm thinking the amp is the cause of the draw. Anything else I can check to make sure?

Also, SI seems to be all over the place. Pictures show the location of the amp is in the back of the truck when it's actually behind the glovebox. Diagrams can't seem to make up their mind on wiring colors, etc.

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Helpful
Troy Owner/Technician
Washington
Troy Default
 

the radio usually has a cooling fan and maybe the fan is dead and the radio is still trying to cool or its just when they loose there minds this is the out come and as for SI they try but they usually cant even get wire color right

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Randy Diagnostician
California
Randy Default
 

Not uncommon for amps to do this

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Jj Technician
Massachusetts
Jj Default
 

Yeah, I was fairly confident the amp is no good. Just wanted to make sure I wasn't getting tunnel vision or something.

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Albert Owner/Technician
Pennsylvania
Albert Default
 

SI ??

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Jj Technician
Massachusetts
Jj Default
 

Service information. Not sure if it's because there were so many different options on these trucks or what.

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Geoff Diagnostician
Hawaii
Geoff Default
 

Probably. Was this All-Data or GM GlobalConnect?

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Jj Technician
Massachusetts
Jj Default
 

Alldata, oddly enough the only thing that listed the correct location of the amp was the third-party wiring diagram.

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Geoff Diagnostician
Hawaii
Geoff Default
 

Too funny....the location hints is only thing those are good for most days :-)

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Randy Diagnostician
California
Randy Default
 

This is why you need more than one service info . I network . I have mitcheal another shop I deal with has alldata and another has identifix and I have mbz shop that has oem stuff . And we all help each other out

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Mark Engineer
Colorado
Mark Default
 

Jj Had identical problem with 99 Cobra Mustang. Used thermal camera through dash vents to find it. Installed relay to only supply power to amp when key was on. Not perfect but customer appreciated not having to spend $$$

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Jj Technician
Massachusetts
Jj Default
 

Customer opted to put a switch in the glovebox, I like the relay idea better. Thanks Mark.

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Stuart Mobile Technician
Illinois
Stuart Default
 

I had a 98 or 99 Monte Carlo that had a timer in the radio that would shut the dome and instrument panel lamps off after 10 or 15 seconds after locking the doors​.​Well the timer was bad and causing the lights to stay on and since all the lamps were burnt out we had a rough time pinpointing it until we got a factory manual and had the layout for the radio​.​Went through 4…

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Mohammad Owner/Technician
Illinois
Mohammad Default
 

What type of fuse is it and what is its amp rating that you are seeing 0.9V across it? M.S.

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Jj Technician
Massachusetts
Jj Default
 

25 amp mini fuse under the hood had .9mV across it. Pulling it dropped the battery draw down to 25mA after sitting over night.

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Robert Diagnostician
California
Robert Default
 

Maybe tin wiskers? Cross connecting circuits and turning on the amp.

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Jj Technician
Massachusetts
Jj Resolution
 

Radio was operating properly and not keeping Amplifier awake, customer opted to have us install a switch to cut power to the Amp when the vehicle is left off over night.

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