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Old 01-06-2018, 07:27 AM   #1
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Back Up Trigger Signal?

2005 E350 EB.................

Installed an Ecco brand back up camera, its up and running but I'm looking to have it turn on when the reverse lamps are on. So far I've tapped into the wiring harness just aft of the B-Pillar, black/pink wire that feeds the reverse lamp bulbs---nothing. (I'm using the correct EVTM for my year/model, the circuit is very simple.

Has anyone else installed a stand-alone separate back up camera/system and if so where did you find a signal to trigger it?

Any help, ideas or suggestions greatly appreciated, TIA!

J W
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Old 01-06-2018, 07:44 AM   #2
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Mine is tied into the tail light reverse light. The wire is in a pre made harness with the camera wiring.
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Old 01-06-2018, 08:00 AM   #3
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JWA: a couple of simple suggestions for troubleshooting....

..convince yourself that applying 12V to the camera wire in question turns it on...touch it to the B+ etc.....

Check the voltage in the black/pink wire when in reverse......
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Old 01-06-2018, 10:56 AM   #4
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What I don't have is any voltage at my point of splicing which is indeed the correct wire for reverse lamp illumination. I've tested this with key in "run" position and the lamps do illuminate and extinguish relative to the shift lever.

The entire camera/monitor system is up and working fine, for now I'm simply applying +12 VDC to assure my installation and wiring are correct. Apart from my wanting it to turn on only when "reverse" is engaged all is good for a final install and replacing interior panels.

I "think" (aka assume, guess ) I need to tie an actual tap to the grounding side of the reverse lamp holder/socket. This van had an interior back up alarm that had ceased working but as I recall now it was triggered by the reverse lamps coming on but that lead wire was after the bulb----I'll try replicating that action and all should be (hoping, guessing) that'll work just fine.

I'll update this in case it might benefit someone else at some point.
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Old 01-06-2018, 04:23 PM   #5
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On my '07 GMC there is a fuse for trailer reverse lights in the under hood box. I used a fuse tap.
Here's a link for reference.

https://www.autozone.com/electrical-...-tap/32416_0_0
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Old 01-06-2018, 05:04 PM   #6
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Quote:
Originally Posted by gahamby View Post
On my '07 GMC there is a fuse for trailer reverse lights in the under hood box. I used a fuse tap.
Here's a link for reference.

https://www.autozone.com/electrical-...-tap/32416_0_0
That's WAY too simple! Ford would never do it!
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Old 01-06-2018, 05:27 PM   #7
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There's no fuse for reverse lights? Not even the ones in the tail light housings?
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Old 01-06-2018, 05:32 PM   #8
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"I need to tie an actual tap to the grounding side of the reverse lamp holder/socket."

If you have to go this route, wouldn't you want to tap the line side of the reverse light socket? If you tap the grounding side don't you eat the voltage drop from the bulb?
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Old 01-06-2018, 06:10 PM   #9
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That's WAY too simple! Ford would never do it!
So Ford protects the reverse light/running light relays with a fuse but nothing on the load side of the relays?
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Old 01-07-2018, 04:08 AM   #10
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Updating this, not good and Scotty86 has it right: Ford does NOT make it simple!

What I've discovered is the black/pink wire shown in my schematic doesn't carry the reverse lamp signal as pictured. I'll have to dig into the connector body itself (C3136) looking for the signal from the DTR (Digital Transmission Range) sensor. Only in that way will I know which wire carries my sought-after signal.

Some days I really wish I weren't so anal about wiring---but sadly this isn't that day. By tapping into the correct wire with proper connections I'll know once everything is covered up with paneling, insulation etc chances are greatly reduced of that modification becoming an issue later on.

Thanks for all the input guys---thought-provoking and helpful and so much appreciated. I'll be back once everything's working as planned.
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