mph converter wiring issues? supra guru's needed

[jonny mac]

hi guys, currently have a mph converter wired into my car, I know for a fact it's not done right,

 

here's the deal, when you turn the lights on, the odometer trip starts counting. no matter what gear you're in, if you're parked in P with the handbrake on it still does it

 

lights go off and it's perfect and won't climb the trip

 

 

so, I don't know if this is an issue the car has had since before I bought it, the only thing I've changed is the rear lights to facelift ones (prefacelift car)

 

I've no idea who installed the converter or what make it is,

 

today I took the dash apart to inspect the wiring of the mph converter

 

here's what I found:

 

 

 

 

 

the plug behind the tell tale dash panel has had the pink wire and blue/red striped wire cut, they have been joined together on the original loom and then a wire ran into the back of the white plug (where the blue/red one goes)

 

that wire then runs back to the rear of the clocks which by my calculations following the circuit board goes to the blue/red wire too (so he's remade the connection)

 

the rest are joined to the back of the clocks like so:

 

 

 

the only blessing here is that the car would have recorded more mileage than it actually has done on the road so technically it's a lower mileage supra than indicated on the dash haha

 

 

I don't have a pinout for the converter unit as I'd like to check it was wired in right but my thoughts are to cut it out, rejoin the factory wires behind the odometer and start again with a whole new converter that's proven to work good on supras....any advice would be great

[Chris Wilson]

I would follow your last sentence and start again.

[jonny mac]

I would follow your last sentence and start again.

 

Sounds right for me tbh. Make it as easy as I possible haha.

 

Only rejoining two wires and snipping the back 4 off the speedo.

 

Any recommendations for speed mph converter to buy ?

[black_widow87]

http://www.ncs-systems.com/speedm8-basic.html

[jonny mac]

SORTED

 

car's not actually been on the road yet since buying it so this has been a job on the list of things to do. I've been waiting for a sunny day to roll it out the garage and work on it

 

don't know why but the previous keeper had mixed up the odometer illumination wire with the ground causing a signal to go against the earth wire, this caused the odometer to receive a false signal and was causing it to climb slowly when the lights were on when the car was stationary

 

all fixed now, I cut out the old mph converter and rejoined the two wires back together matching up the blue/red strip wire to the other half and the pink wire also,

 

 

going to run my own mph converter now wired in my way so I know it'll work and be done properly!