SpeedM8 Chip or dashboard problem ... please advise.

[Matt&JoyBongling]

My dashboard only has 3 wires going into the back (apart from the 2 looms at the top). They come from my Speedm8 Kph to Mph chip - red wire to Ig (gives 12 – 14v), Black to SP+ and White to SP-. There is no wire to SP Out . The only wire left from the speedm8 is a grey wire that is also connected to my cruise control and is blanked off with insulating tape & I am not sure whether it should also be connected to the SP out?

I disconnected the wires recently to install the low coolant alarm light in the dashboard and as part of my alarm fitting. I thought that I had labelled & rewired them correctly but the grey wire from the Speedm8 was blanked off with insulation tape which I feel I would have only done if it was not used but I could be mistaken.

Since or soon after then, I have not had any speedo or odometer readings & get a flashing hold light. If I bypass the Speedm8 chip, I get the readings but in Kph. I don’t want to connect the grey wire without confirmation that it should be used.

Any advice?

[Simon Jones]

The grey wire will probably be missing from the screw shown with the blue wire below (I had a diffenent make of chip, hence the different colour wires). This is where the chip output should connect to the instrument panel. Speedo chips need 4 wires connected:

+12v
0V / earth
SP in - from gearbox
SP out - to speedo

[Matt&JoyBongling]

Many thanks Simon, I'll try it in the morning.
Cheers,
Matthew

[Matt&JoyBongling]

OK ... my moment of muppetry is over (I hope) . The grey wire is accounted for and takes the signal from the blue / white wire in the wiring loom that gives a speed in KPH if connected back to the top of the dashboard.

My problem continues my speedo is still not registering ... how can I tell if a pulse is being sent by the speed conversion chip?

[Simon Jones]

Not sure if a multimeter connected to the output & ground will show any sign of a pulse as it may be too quick to register on the meter. If I understand it right: when you bypass the chip the speedo then reads ok in Km/h? If that is the case, then either there is not power getting to the chip, or its knackered.