Need a switched ignition feed..
Discussion
Is it ok to take one from the fusebox well tap in to an existing wire.
Its to run fan control on my megasquirt im using the below wiring diagram.
http://www.extraefi.co.uk/Drawings/PDF_Files/cooli...
Not really understanding relays but most the cables I see at the back of the fusebox look quite small, does it require a large feed for pin 85, im assuming the real load on the wire is from pin 30 to the fan.
Ive fan the wires now and ive relocated the fusebox so hope I can but just want to check.
Thanks
Its to run fan control on my megasquirt im using the below wiring diagram.
http://www.extraefi.co.uk/Drawings/PDF_Files/cooli...
Not really understanding relays but most the cables I see at the back of the fusebox look quite small, does it require a large feed for pin 85, im assuming the real load on the wire is from pin 30 to the fan.
Ive fan the wires now and ive relocated the fusebox so hope I can but just want to check.
Thanks
spend said:
Forget Phils diagram, just connect your megasquirt side to the pink/green (IIRC its OTOMH from long time ago) wire that goes from the otter switch into the fuse box. Easy to find if you lift the fusebox and look at the connectors, as well as nice & close to your ECU.
I dont have the otter wiring in the engine bay anymore its all gone, and I have re-located my battery to the boot, fusebox behind the seat and my ECU now lives all alone in the footwell.
Am I right in assuming you only want a switched live to energize the relay? if so there is one on the front of the fuse box (male spade) of course I am assuming you have the same fuse box as mine so maybe not 
there is a few under the top of the dash as well I used one for the switchable map circuit I would recommend using an inline 3 amp fuse when you do find one for that job as the fusebox one my be unfused internally,better to be safe than sorry 
there is a few under the top of the dash as well I used one for the switchable map circuit I would recommend using an inline 3 amp fuse when you do find one for that job as the fusebox one my be unfused internally,better to be safe than sorry Edited by Simon says on Wednesday 23 February 09:35
Simon says said:
Am I right in assuming you only want a switched live to energize the relay? if so there is one on the front of the fuse box (male spade) of course I am assuming you have the same fuse box as mine so maybe not there is a few under the top of the dash as well I used one for the switchable map circuit I would recommend using an inline 3 amp fuse when you do find one for that job as the fusebox one my be unfused internally,better to be safe than sorry
I will have another poke around tonight with a tester, but would ideally like it from the fusebox as I have run the cables already (fusebox behind seats now), these go to a another small fuse board in the footwell for the megasquirt outputs. If pin 85 only energize's the coil it doesnt need to be a big beefy wire, correct there is a few under the top of the dash as well I used one for the switchable map circuit I would recommend using an inline 3 amp fuse when you do find one for that job as the fusebox one my be unfused internally,better to be safe than sorry Edited by Simon says on Wednesday 23 February 09:35
Thanks
Yes that's right. The relay coil only requires a few milli amps to turn it on, but you still need a small fuse in this cicuit for protection.
Then the feed to the fans will require the larger fuses (40 amps from memory)or if you get a double pole relay then each fan will have it's own set of contacts and fuse then if one fuse blows you still have the second fan runing.
The fuse will obviously go between the fuse board and relay so the relay contacts have some protection too.
Good luck with the install.
Paul.
Then the feed to the fans will require the larger fuses (40 amps from memory)or if you get a double pole relay then each fan will have it's own set of contacts and fuse then if one fuse blows you still have the second fan runing.
The fuse will obviously go between the fuse board and relay so the relay contacts have some protection too.
Good luck with the install.
Paul.
Ribol said:
Simon says said:
Am I right in assuming you only want a switched live to energize the relay?
Most otters earth the OE fan relay to energise it AFAIKBCBWIYSWIMOAIMS 
.let me rewrite that bit then for you......"Am I right in assuming you only want an IGNITION switched live to energize the relay" is that OK for you then IVAN? do you want to check Neal1980's attached PDF file? and you can stick your acronyms too 
iget fed up with looking them up your worse than Spend Edited by Simon says on Wednesday 23 February 10:27
Simon says said:
............and you can stick your acronyms too iget fed up with looking them up your worse than Spend
I don't know what that means and I wrote it, I am sure people only do it to try and look clever or more likely because they can't spell all those words properly anyway iget fed up with looking them up your worse than Spend 
neal1980 said:
spend said:
Forget Phils diagram, just connect your megasquirt side to the pink/green (IIRC its OTOMH from long time ago) wire that goes from the otter switch into the fuse box. Easy to find if you lift the fusebox and look at the connectors, as well as nice & close to your ECU.
I dont have the otter wiring in the engine bay anymore its all gone, and I have re-located my battery to the boot, fusebox behind the seat and my ECU now lives all alone in the footwell.Gassing Station | Chimaera | Top of Page | What's New | My Stuff