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Old 04-10-2004, 10:00 AM   #1
Scooby Specialist
Member#: 16980
Join Date: Mar 2002
Location: QC, Canada
Default Too much Power Sourced from Radio !? help...

So i have a LCD screen (Mattjk), powered from the radio, a seperate deck unit mounted under the seat, and a HKS CAMP + Junction Box all connected to that same wire (add some other little wires to run up to the amp, etc etc).

FYI, the CAMP is a simple Monitoring computer, i doubt it takes up alot of juice but its still connected to the radio power wires.

so here's the deal, sometimes when i start the car up, the CAMP wont start up, and other times it will ... i noticed its also only during small intervals, (if i stop the car to fill up on gas) and start it again, the CAMP wont turn on.

i know my connections are good, they are all soldered and heatshrinked, i have done car audio-video many times but this problem really has me baffled.

i dont know if i'm asking too much juice from that single power wire ? or maybe the fuse is not letting enough power ... i really have no clue.

any ideas ?
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Old 04-10-2004, 10:16 AM   #2
Trust no one
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


Could be, but this isn't something we can tell you here for certain. What you need to do is determine the actual current draw of each device, add them up, and see if it's too much for the circuit. There should be specs in all the manuals for power requirements that will tell you how much each unit draws, and if you can't find it you can connect an ammeter in series with the power wire to measure it.
You can also probe the troublesome unit(s) with a voltmeter and watch the voltage as you turn it on, to see if there is an excessive drop causing the problem.
As I'm sure you're aware it is also very important for each unit to have its own good ground connection. You can do voltage tests on the ground side as well to look for any drop there.
Could also be an issue with voltage spikes and dips when starting the car, the unit might not like those.
In general you'd probably be better off wiring this stuff to a separate accessory circuit with a higher capacity.
Mulder is offline   Reply With Quote
Old 04-10-2004, 10:41 AM   #3
Scooby Specialist
Member#: 16980
Join Date: Mar 2002
Location: QC, Canada

awesome post,


they are all connected to the same ground, so that might be an issue, i will check the current drawn from the devices, and check how much it all adds up.

i'll let you guys know.

thanks Mulder
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