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    No power at ignition wire

    I got everything so far lookin good in my 1987 Mercedes 260E.

    ...but I can't seem to get any power from the ignition wire for some reason. The +12V constant reads 12v...but (ignition on obviously) the +12V switching wire reads nothing.

    I have replaced the fuse in the fusebox and still nothing.

    Would I be able to bridge it with the constant +12V? If so would it drain the battery if I made sure to turn off the radio before I left the car? (for a temporary solution until I can get an electrical diagram for somewhere to attach to)







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    Re: No power at ignition wire

    did you turn the key and test the ignition source?



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    Re: No power at ignition wire

    Quote Originally Posted by fasfocus00 View Post
    did you turn the key and test the ignition source?
    Yes I did.

    Quote Originally Posted by ps2cho View Post
    I got everything so far lookin good in my 1987 Mercedes 260E.

    ...but I can't seem to get any power from the ignition wire for some reason. The +12V constant reads 12v...but (ignition on obviously) the +12V switching wire reads nothing.

    I have replaced the fuse in the fusebox and still nothing.

    Would I be able to bridge it with the constant +12V? If so would it drain the battery if I made sure to turn off the radio before I left the car? (for a temporary solution until I can get an electrical diagram for somewhere to attach to)




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    Re: No power at ignition wire

    Check your cigarette lighter and see if that's switched. Otherwise run it to an accessory in the ignition harness.

    I personally wouldn't ever run it to a constant, but yes, it will work.



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    Re: No power at ignition wire

    I have the same problem in my car Suzuki right now. I just sent a power wire to the battery and manually turned off the HU for a temporary solution. I'm thinking there's another fuse somewhere between the harness and fuse box.




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    Re: No power at ignition wire

    Quote Originally Posted by x1le View Post
    Check your cigarette lighter and see if that's switched. Otherwise run it to an accessory in the ignition harness.

    I personally wouldn't ever run it to a constant, but yes, it will work.
    Good idea about cigarette lighter. That will work!

    I'm relatively new to electronics. I had bestbuy install my headunit in my other car because it was free...but I'm reasonably handy so I figured I'd give it a go myself this time.

    That should do the trick. I'll report back if it doesn't.

    Thanks!




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    Re: No power at ignition wire

    those old german cars usually have a weird relay setup IIRC so try something else that has switched power.



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    Re: No power at ignition wire

    Quote Originally Posted by SicAudio View Post
    those old german cars usually have a weird relay setup IIRC so try something else that has switched power.
    Yep that worked so its powered up now.

    I'm really struggling figuring out the wires for the speakers...this *****
    Spent the last hour searching M-B forums and can't find anything on what color wires that go into the fader are for the speakers.



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    Re: No power at ignition wire

    they dont make a wire harness kit for that?



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    Re: No power at ignition wire

    I had this problem with my car also. I just ran a new wire from an accessory fuse in the fuse box. Fairly easy. Haven't had any problems since.




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    Re: No power at ignition wire

    Quote Originally Posted by oldschool4me View Post
    they dont make a wire harness kit for that?
    They do, but it only covers the Ignition, constant, ground and power-ant.....all of which can be cut and done for free....sure its easier....but I'd rather save $35. I'll never take out this HU so its not like im making it hotswappable.



    1988 Mercedes 300TE 94k miles
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    Re: No power at ignition wire

    and the way the electrical is setup on them is thru odd relay setups. constant power actually shuts off lol so much for constant power! have you seen the funky fuses the old european cars use? weird **** man. 22 yrs as a tech I never saw such a mess in my life as they are lolz.



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    Re: No power at ignition wire

    Quote Originally Posted by SicAudio View Post
    and the way the electrical is setup on them is thru odd relay setups. constant power actually shuts off lol so much for constant power! have you seen the funky fuses the old european cars use? weird **** man. 22 yrs as a tech I never saw such a mess in my life as they are lolz.
    You mean these ?




    1988 Mercedes 300TE 94k miles
    1987 Mercedes 260E 84k miles

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    Re: No power at ignition wire

    So what's the cause of this?




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    Re: No power at ignition wire

    No idea...

    I got a question though -- My Pioneer headunit (DEH-2100I) won't save any of my settings....Is that normal? If I change the equalizer and turn off the unit -- then back on it won't save it.
    Could it be possible I have the constant + ignition wires the wrong way around? Or would that not make sense?



    1988 Mercedes 300TE 94k miles
    1987 Mercedes 260E 84k miles

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