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Power constant not hot enough


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dugawug 
Member - Posts: 6
Member spacespace
Joined: June 15, 2006
Location: United States
Posted: June 16, 2006 at 11:33 AM / IP Logged  
arniek wrote:
Try just getting your constant 12volt from a lead you use for an amp.
you mean the blue/white cable that comes from my sub's amp?
i thought that was getting power from the head unit?
or is that cable itself giving power to the head unit?
in either case, i'll try. that may be how i did it before. something just isn't right here.
lastly, i was thinking to go to the fusebox, try to measure volts of each fuse, find one with a similar weak 3-4V strength, remove it and make sure the cable also lacks power, then replace that fuse.
these old school fuses are weird. sometimes they look fine, that is, no break, but they run so damn thin, it looks suspicious to me.
geepherder 
Platinum - Posts: 3,627
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: June 16, 2006 at 6:33 PM / IP Logged  

What he means is if you have an aftermarket amp installed, you already have constant power running to it.  You can fuse there, and run a lead up front to the radio.  You can also test the wires at the ignition harness and see which is constant.  Either way you won't have to run all the way to the battery.  Be sure to fuse close to where you connect for power wherever you do.  Just use some 16 or 18 gauge wire and a 10 or 15 amp fuse will do fine.

Also, any wires you don't use behind the deck need to be insulated (use tape, crimp caps, etc.).

My ex once told me I have a perfect face for radio.
Melted Fabric 
Silver - Posts: 509
Silver spacespace
Joined: October 24, 2003
Location: California, United States
Posted: June 16, 2006 at 6:44 PM / IP Logged  

I have sometimes been in the habit of soldering or wrapping the constant and the battery lead together so the unit can work without the key in the ignition, not sure if you want to do it that way.  If you are going to cowboy it and run all new wire, be sure to have fuse along the line(s) of current... if not going through the fuse box.

Mercedes are a huge hassle, just to even get to the damn dashboard speakers it is tough.  First installation I failed.  I let my friend take it to the shop cause I did not want to mess it up any further.  German engineering is too advanced for it's own good.

I have not failed. I've just found 10,000 ways that won't work.
When you do not know what you are doing and what you are doing is the best -- that is inspiration.
geepherder 
Platinum - Posts: 3,627
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: June 16, 2006 at 7:01 PM / IP Logged  
His problem is not with the switched wire, though, so connecting the two together would not allow him to turn it on with the key off.
My ex once told me I have a perfect face for radio.
dugawug 
Member - Posts: 6
Member spacespace
Joined: June 15, 2006
Location: United States
Posted: June 17, 2006 at 2:42 AM / IP Logged  
well, thanks everyone here, this forum is awesome, but my PROBLEM IS SOLVED!
long story short, i think i've got some minor electrical problems. pulling the fuse connected to that power constant out and back in a few times and it seems to hold a steady 12volts finally.
the fuse is fine, it just needed to be taken out a few times, and seemingly random, now it pumps out a good 12v.
i have had some funky electrical issues lately, so it all makes sense. anyway, it may not work perfectly for long, but it does now and at least i know where the problem is.
thanks all here. this forum is great. i'm lovin my system once again.
now i just gotta remember to keep taking out the faceplate from my car, or someone will jack my doodie again!
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