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Thread: Wiring backup/Rearview camera -- can engine crank damage?!

  1. #61
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    Your camera shouldn't draw more than 1 amp on the 12V line of the Opus...so unless you are cutting things REALLY close right now, I'll bet the Opus can handle 1 more amp It's easy to check it anyway - just push the +/- wires of the camera into one of the free molex connectors from the Opus (yellow is 12V and black is ground) and if the Opus cuts out then I guess you are drawing too much power...but unlikely.

  2. #62
    Raw Wave justintime's Avatar
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    OK guys, need a second brain to sort this out. I decided to wire the camera to the OPUS, use a relay, and put an override switch. Phew!

    OK so this is strange. I first wired the camera directly to OPUS, with a fuseholder on the + line. I put a 1 Amp fuse, and it blew. Ok, so this means the camera draws more than 12 Watts?! Yikes! So I put a 2 AMP fuse, and it did not blow. tested for a while, all was fine, so I proceeded with the more complex wiring using relay and switch etc.

    So here's what's strange... after wiring it all, it is blowing a 2 Amp fuse. So, it is drawing more than 24 watts (2amps x 12V = 24 Watts).

    Note that I tested the coil voltage on the relay (control circuit) and it was a nice 12V from thr acc as expected, and also tested the high voltage circuit of the relay before connecting the camera, and it had a nice 12V too coming from the OPUS. But as soon as I connect the camera, it blows the 2 Amp fuse!

    I have not tried a 3 Amp fuse yet, but this is getting ridiculous. more than 24 Watts for the camera?! Ouch.

    Any ideas what's going on?
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  3. #63
    Variable Bitrate StrataG's Avatar
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    Run us through a quick connection schematic. No need for a diagram, just what is connected to what.

  4. #64
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    I assume you are also wiring up the camera ground to the opus? Also, is the polarity at the camera correct? That would cause it to blow no matter what size fuse you have.

  5. #65
    Raw Wave justintime's Avatar
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    Thanks Strata....

    quicker to draw the diagram... quick and dirty as they say.

    Keep in mind that in my testing, I never got to wire the reverse lamp yet, so imagine that one is not there for now.
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  6. #66
    Variable Bitrate StrataG's Avatar
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    How close is the fuse to the Opus? Should be as close as possible. Also what check what sivart said about polarity. Double check all your connections and make sure you are indeed wiring them up to the proper terminals.

  7. #67
    Raw Wave justintime's Avatar
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    Strata... the fuse is within 4 inches of the opus. (!) Could not get any closer.

    Polarity has been triple checked. Like I said, if I simply bypass the relay by connecting the possitives together (between camera and opus) all is fine with a 2 amp fuse. Polarity is hence OK.

    Do you guys think there might be something wrong with wiring the grounds together to the relay the way I did it? Doubt it, but who knows.
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  8. #68
    Variable Bitrate StrataG's Avatar
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    Quote Originally Posted by justintime
    Do you guys think there might be something wrong with wiring the grounds together to the relay the way I did it? Doubt it, but who knows.
    I contemplated that myself. I have never done that when running relays. Try grounding it to the chassis and see if that solves things. You may get some noise that way, but at least you could see if that is the problem.

  9. #69
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    I would like to put a multimeter on your camera circuit and see exactly how much current it is using on a digital readout...my camera uses 1.2A as per the spec sheet...I find it hard to believe that your camera actually wants MORE than 2A!

  10. #70
    Raw Wave justintime's Avatar
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    Jackboot: I have a multimeter with me. I was able to measure the Voltage feed, but I really don't know how to measure the power draw.

    If you can explain to me, I will go ahead an calculate the draw (I will connect it using a 12V DC transformer for that test).


    EDIT: Seems like I just have to connect it in series on the wire. My multim,etere has a setting for AMP (10 amp unfused).

    Thanks!
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