Rewire

[tractor]

Put some fuel in the tank today to test pump and fuel lines all seems OK so back to the wiring on my next day off

[jaimo]

Well done so far chris i building myself up to rewire megajolt already got loom but bit of a mess

[tractor]

the megajolt is a breeze compared to the megasquirt i went for the ms3extra thinking dooing away with edis would reduce the amount of wiring but it backfired a bit theres at least tripple the amount of wiring now

[jaimo]

Oops

[tractor]

today i mounted the megasquirt and the vvt controller to the dash also mounted three relays got a bit more wiring done the engine turns over now and before any one says are you out for a run at the weekend there is still lots to do

ecu 47 wires

vvt 6 wires

wipers ????

side repeaters

handbrake

reverse light

all of the dash still to do many many many wires

but there is a light at the end of the transmition tunnel

[tractor]

am i right in thinking that i have to run a 12 volt supply through the fan switch back to the relay for the fan ??????

it may be a stupid question to some but electricary aint my thing

ah or is terminal 86 on relay a switched earth through fan switch???

Edited April 5, 2017 by tractor

[tractor]

ok i have sorted it

needs to be 12v feed

[tractor]

now i am confused just read that it is a switched earth through fan switch

but then where is the power coming from to activate the relay

Edited April 5, 2017 by tractor

[tractor]

bugger it going to put live through fan switch

[Longboarder]

Stop. Relax. What component is giving the command. If ECU then that will be switched earth to the ECU from relay pin 86, live to 85. If radiator sender/switch then it can be wired either way, Supply sender relay earth or supply relay sender earth. If it is a mechanical dash switch then it can be as for sender. ECU is only one that is obligatory switched earth. (That's how ECUs do their thing)

For the fan power wiring, pins 30 and 87 it can be similar. Supply 30 87 fan earth or supply fan 30 87 earth.

The two circuits through the relay, 85/86 and 30/87 keep totaly separate.

 

Nigel

[tractor]

thanks for that nigel its the switch on the radiator so i will run live through it

[fry61]

Use the live side of the starter motor for your fan motor earth & then the fan cannot run when cranking engine.

[tractor]

thanks bob already seen another post on that issue so going to run fan switch from accessories position on ignition

[fry61]

That will achieve the same result, Chris; good thinking. ( On Florin's ignition switch -- that bit is fubarred )

[tractor]

oh god been at it for four hours just wiring up three relays routing wires then re routing them ahhhhhhhhhh