yamaha guage problem please help

[TCOBI]

i have a cobia 184cc with a 115 yamaha and started to have a problem with all the guages.they started to go haywire bouncing back and forth and hardley even move now.nothing is working at all.I've seemed to trace the problem to black box under the console. it reads medallion 1600.what is this?is this my problem?where can i get a new one?thanks for the help T

[rodbolt]

what year is the motor ? some of the old old yamhas had a converter box. what brand are the gauges.

[TCOBI]

sorry, the boat and motor are 2000,i don't know the brand of the guages, i dosen't say anywhere

[rodbolt]

I cant think of any black boxes that control the gauges. apearently they are not yamaha guages. this is where a picture of the guages,keyswitch and back side of the gauges would be nice. if the keyswitch and gauges are yamaha I can tell you the wire colors to test. sounds like you have lost the 12v power or the ground lead.do you have a seperate keyswitch or is it a 703 sidemounted control with a builtin keyswitch ?

[TCOBI]

rodbolt, it is a 704 control with a seperate key switch.the black box has two plugs going in with pink,pink/blk,green on one plug and red,yellow and blk on the other.the plug comming out going to the guages has red, black and purple.all of these wires plug into every guage with a blue wire from the rocker swith to light them up.the black box also has a clear tube that connects to it marked prime.the wires are connected to the guages with a four pronged plug to each guage

[rodbolt]

you have non yamaha equipment that required a converter.what model is your 115. pink is trim send,pink/blk is overheat visual,green is tach signal,red is 12v+,yellow is 12 key on + and blk is ground. but a model number will help me more. some pictures would be even better. thats why I only deal with OEM stuff as it requires no adapters . so far I cant find any medallion parts for a yamaha on the net. the pink/black indicates its a 4 stroke but sometimes 2 strokes get rigged with that harness.

[TCOBI]

rodbolt,thank you for your intrest.i've got a pic of the box but i cant seem to post it.but it reads medallion mdc-1600,i have also looked everywhere for the medallion brand but only found it in a moomba fourm.my motor model is c115txyr it is a two stroke.thank you