Electrics

Now all the mechanical bits are done it is time to wire everything up. Mainair provide a junction box near the engine to provide easy connect for sensors etc. They also provide a 12 core screened cable that then routes along the skirt to the panel.

Since I had chosen to use the Engine Information System, EIS, from Grand River Technologies in the states then the suggested wiring was not going to work.

The spec. I ordered for the EIS was:

EGT * 2, CHT * 2, Water Temp, RPM, Volts, Outside Air Temp, Fuel Flow Sensor, twin alarm indicator, audio alarm. The EIS also comes with time elapsed and total time functions. I also ordered the EIS with external cold junction compensation so I could use normal wire interconnect from the sensors to the unit.

After some thought I worked out a wiring scheme that would allow me to use the 12 core screened cable from Mainair for all the sensors connections to the EIS. GRINN_EIS_Patch_Lead.xls

Title:

Patch Lead Mappings for Mainair Blade G-RINN

Date:

15/12/2000

Version:

1

 

 

 

 

 

 

 

Source

Patch

Terminal

Harness

EIS

EIS Terminal

Comment
             

CHT 1 White

White/Brown

11

Black

White/Brown

4

CHT extended

CHT 1 Red

Red/Brown

10

White

Red/Brown

17

  
             

CHT 2 White

White/Green

9

Blue

White/Green

2

CHT extended

CHT 2 Red

Red/Green

8

Turquoise

Red/Green

15

  
             

EGT 1 Yellow

Yellow

15

Grey

Yellow/Blue

3

EGT wired to terminal without

EGT 1 Red

Red

14

Pink

Red/Blue

16

extension
             

EGT 2 Yellow

Yellow

13

Violet

Yellow/White

1

EGT wired to terminal without

EGT 2 Red

Red

12

Red

Red/White

14

extension
             

Coolant

Red

16

Orange

White

8

Follow CHT cable route
             

Tacho

Grey

1

Yellow

Grey

5

Route with CDI kill connections
             

Ignition Kill 1

Blue

6

Yellow/Black

n/a

n/a

CDI Kill 1

Ignition Kill 2

Yellow/Green

5

Yellow/Black

n/a

n/a

CDI Kill 2

Ignition Kill Common

Brown

7

Brown

n/a

n/a

CDI Kill Common Ground
             

FlowScan White

White

3

Green

Orange/Black

25

  

FlowScan Red

Red

2

Brown

Red/Grey

6

  

FlowScan Black

Black

7

Screen

Black

13

  
             

EIS 12v

Red

n/a

n/a

n/a

n/a

From switched/fused supply 1A

EIS 0v

Black

n/a

Screen

Black

13

Screen is EIS Instrument Common
           

Ground ONLY

All the wiring was double and sometimes treble insulated using heat and solvent retardant covering. All connections were soldered and glue heatshrink covered to maintain mechanical strength and keep out the elements. Quick car type connections were not an option! All power to the front panel is fed from the engine bay, and not the battery despite it being near the front panel. An earth was taken from the regulator to the front panel to provide power return, and the power feed to the starter switch was used to also provide main power at the front panel. A distribution power block was used mounted on a bracket behind the panel for power to all electrical subsystems.