little electric problem for reversing

**sinisa** · 01-27-2012, 06:27 PM

hi,
i have lilliput 629 with trigger cable for reverse cam. it was running perfect for couple of months then it start to trigger when i brake.
however there is little impulse when i brake so it goes av and back to pc simultaneously for once. i guess i have problem with my trucks taillight. i will solve it next service day.
during this period, iwant to make a delay circuit that eliminates the impulse from the brake light. i ve googled some and find a circuit with rc,relay, diode.
it is little complex for me so i wonder if i can make delay with simple rc circuit.

**soundman98** · 01-27-2012, 06:53 PM

you could try to either add some diodes in-line with the wire, or possibly try a 1k ohm resistor to reduce the surge..

**mayhembdm666** · 01-28-2012, 08:11 AM

Where did you connect the wire itself? to the reverse lights or the reverse switch itself??

This should not be happening unless your getting a cross feed or something happening, I would disconnect the monitors wire and reconnect it just to check/test as could be a something simple that is causing it.. Then wire it up with either a relay or something.. Also have you fused that wire? I know some people dont like to... but some have learnt the hard way by not doing so.

**soundman98** · 01-28-2012, 11:13 AM

i remember seeing this issue before, i believe that most solved it by installing a relay to trigger the the reverse wire..

it is just part of integrating with the cars wiring-- some cars are just funky like that..

**mayhembdm666** · 01-28-2012, 11:41 AM

I can understand some vehicles are just ... well not common sense wired..
but to have a vehicle where the brake itself triggers the reversing circuit? That would mean in mine things like the mirrors adjusting to a pre set for reversing any time i tap the brakes.

So by using a relay it would be counting on the relays switch time? just seems a little uneasing that it would work in that way... But such is technology

**OldSpark** · 01-28-2012, 05:52 PM

It's often connections - the increase resistance hence higher voltage spikes (despite less current).
R&R'ing connections and bulbs etc often fixes the problem till next time.

Hence why many prefer using a relay (using fused power from the battery),

**soundman98** · 01-28-2012, 09:50 PM

Originally Posted by mayhembdm666

So by using a relay it would be counting on the relays switch time? just seems a little uneasing that it would work in that way... But such is technology

kind of-- the relay's coil is going to be less sensitive to tiny variations in voltage(the physical switching can play a very small part in that), where the reverse wire input on the lcd can be extremely sensitive..

**mayhembdm666** · 01-29-2012, 10:19 AM

Ok, so the issue at hand is more the actual signal wire vs the vehicle itself.

**soundman98** · 01-29-2012, 01:35 PM

i would say it is half-and-half..

the lcd shouldn't be that sensitive, and the car shouldn't be outputting any amount of voltage on that wire unless you are shifting past reverse..

**sinisa** · 01-31-2012, 03:50 PM

thanks everyone for your answers

Originally Posted by mayhembdm666

Where did you connect the wire itself? to the reverse lights or the reverse switch itself??

This should not be happening unless your getting a cross feed or something happening, I would disconnect the monitors wire and reconnect it just to check/test as could be a something simple that is causing it.. Then wire it up with either a relay or something.. Also have you fused that wire? I know some people dont like to... but some have learnt the hard way by not doing so.

i had the wiring done by the one who setup my rear camera. so when this occurs i re check the wiring if there is leakage or sth. it is connected to reverse light wire near the camera. but it is not the wiring.

Originally Posted by soundman98

you could try to either add some diodes in-line with the wire, or possibly try a 1k ohm resistor to reduce the surge..

first i will try resistor if not, i will connect small button to my gear knob so i can change the screen when i need reverse cam. i dont need it everytime and since my truck is automatic i have to select R when going from P to D.(in my opinion the tiny relay like thing in my controller board had burnt because of too many on and off)