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Old 01-20-2014, 02:57 AM   #1
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Default Horn circuit. Alarm install

Hello. Looking to power the horn circuit constant so I can use it for my alarm system. I know the relay is neg triggered and I tried to power the relay with a constant positive with no luck. Any thoughts ?
2006 dodge sprinter
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Old 01-20-2014, 03:21 AM   #2
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Default Re: Horn circuit. Alarm install

How about adding a relay that grounds when active and add it in that way.
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Old 01-20-2014, 03:39 AM   #3
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Default Re: Horn circuit. Alarm install

My problem is the relay is fed from a 15 amp fuse that powers other vital circuits. I need the horn circuit to be hot all the time if possible. I tried to feed 12v to the relay but there's something else in the way ?
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Old 01-20-2014, 04:24 AM   #4
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Default Re: Horn circuit. Alarm install

The power to the horn is only on with the ignition key. So you need to feed power to the hot side as well as grounding. Does your alarm have enough current to feed the horn directly?
In the picture you can see that the green wire is 12v that feeds the horn at #85.
At the same time the alarm trigger will trip a relay you add in to give the relay a ground. This will trip the horn relay and connect the horn to ground. OR you could connect the grounding relay NO (normally open) to #87 on the horn relay and this will trigger the horn without triggering the horn relay.
Not that I've done this, just looking at the diagrams.
from 2006-VA-SM 1.jpg
After looking at this, it might fire up the entire circuit. All the other stuff. You might have to put a double pole relay in to the horn. If that is the case, you might just be as well off to add a new horn/siren to the mix.
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Old 01-20-2014, 03:11 PM   #5
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Default Re: Horn circuit. Alarm install

I did try to cut and feed power to 85. The relay triggers with the push of the horn button but no horn.
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Old 01-20-2014, 03:12 PM   #6
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Default Re: Horn circuit. Alarm install

When I tried to power 85 while still connected it powers up all kinds if other stuff.
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Old 01-20-2014, 03:23 PM   #7
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Default Re: Horn circuit. Alarm install

Quote:
Originally Posted by One call a/c View Post
When I tried to power 85 while still connected it powers up all kinds if other stuff.
A polarity blocking diode installed in the correct position of the circuit should stop the backfeed. S206 is a splice point.

I don't know the horn draw. A 3 amp diode is probably enough, 5 amp rating would be better. Radio Shack sells them. vic

HornDiode.jpg
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Old 01-20-2014, 07:15 PM   #8
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Default Re: Horn circuit. Alarm install

sigh... How To Read A Sprinter Wiring Diagram (and the steps you've gotta take...)

Vic posted: (trimmed to area of interest):
HornDiodeExtract.jpg

See the (circled) 8w-10-22? That means you *really want* to go look at THAT page.

8w-10-22.jpg

... which shows every thing *else* that attaches to that "splice" (S206)

The actual physical "splicing" may not happen at only one point along the wire.

--dick
p.s. personal opinion: the OEM Sprinter "horn" is so pitifully weak.. (could you hear it in a crowed theater, even if it was sitting only two rows back?)(is someone stealing an old VW bug?).. why not install a separate noisemaker in a place that's not so easy to reach (and unplug)? (MB does when they're installing the factory alarm)

p.p.s. this was NOT meant to be a "dump on Vic" (he knows this stuff)... it's to help future readers who might not
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Last edited by autostaretx; 01-20-2014 at 08:18 PM.
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Old 01-20-2014, 07:49 PM   #9
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Default Re: Horn circuit. Alarm install

Quote:
Originally Posted by autostaretx View Post
sigh... ...
Hence my comment.
Quote:
Originally Posted by Aqua Puttana View Post
A polarity blocking diode installed in the correct position of the circuit should stop the backfeed.
I suppose I was a bit short.
Quote:
Originally Posted by Aqua Puttana View Post
S206 is a splice point edit: which you should investigate enough to determine where in the circuit the polarity blocking diode should be installed.
...
I often provide suggestions, not detailed design. Messing with things without a bit of background can be dangerous. I know that from personal experience. Sorry for any confusion.


Quote:
Originally Posted by autostaretx View Post
p.s. personal opinion: the OEM Sprinter "horn" is so pitifully weak.. (could you hear it in a crowed theater, even if it was sitting only two rows back?)(is someone stealing an old VW bug?).. why not install a separate noisemaker in a place that's not so easy to reach (and unplug)? (MB does when they're installing the factory alarm)
I agree. I will add that based upon my next door neighbor's string of false alarms I would be happier if they had used a Sprinter horn.

vic
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Old 01-20-2014, 08:37 PM   #10
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Default Re: Horn circuit. Alarm install

I wrote: "The actual physical "splicing" may not happen at only one point along the wire."

Looking at the schematic diagram, i would have expected the splice to be "distributed" through the Sprinter.
Nope.
Since the power arises on Fuse Block 1 (under the steering wheel), good old S206 may be in the worst possible place for "tapping in" to one leg...
It's in the nexus where it passes through the firewall.

s206.jpg
(page 8w-91-31 in the 2006 manual)

--dick
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Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
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((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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