Wire Spec. for Cruise Control

Mobeetie · 12th July 2011, 23:17

A bit of an odd question but i've been slowly getting round to retro-fitting cruise, i've now got all the parts except for the cruise ECU electrical connector, now it's just the wiring

I've got a diagram and a bit of an understanding where it all should go and so on but with no electrical knowledge at all i just want to see what kind of wire thickness, gauge etc to use?

Thanks

Jakg · 13th July 2011, 00:36

I doubt it'll be high current, but I like using 1.5mm² wiring normally, as it's easy to route, doesn't take up much space, but is still up to taking a bit of power if it needs to.

For higher-current stuff (i.e. my speakers) I use 2.5mm² - not much more expensive, but takes up a little more space.

Most of the OE wiring is ~0.75mm².

0.75mm² = 18-19 AWG
1.5mm² = 15-16 AWG
2.5mm² = 13-14 AWG

The size of the wire only determines how much power you can get away with passing down it - I would imagine cruise control wouldn't draw much power (i.e. it's just sending signals around) so 1.5mm² would be fine.

I also use the 1.5mm² stuff over anything smaller (even for low-current stuff) because I find it easier to work with. The tiny cables you get with LED strips from China are always a ballache to crimp because they're so small...

EDIT - For high current stuff obviously I use proper cable - currently using 54mm² & even 104mm² in places.

James.uk · 13th July 2011, 01:08

I didn't need to mess with any wires when I did mine, everything just plugged in to exiting plugs.

There was one plug for the on/off switch behind the Lil panel that holds the heated seat switches, the other for the ECU was behind and beneath the panel at the the rear of the glove box.

I already had the controls on my steering wheel. Once I had things plugged in it worked.. except .. The "resume" button on the steering wheel does not work.. But I can easily manage without it..

Actually I rarely use cruise, too much traffic innit..

...

Rob Bell · 13th July 2011, 15:07

Quote:

Originally Posted by Mobeetie

A bit of an odd question but i've been slowly getting round to retro-fitting cruise, i've now got all the parts except for the cruise ECU electrical connector, now it's just the wiring

I've got a diagram and a bit of an understanding where it all should go and so on but with no electrical knowledge at all i just want to see what kind of wire thickness, gauge etc to use?

Thanks

Am I right in thinking that you're planning to make the cruise control loom from scratch? If so, I am suddenly sitting at the edge of my seat!

I've been after a CDTi loom for longer than I care admit... and sadly never had the time to fabricate one from scratch.

I don't think that any of the cables take a significant current - so almost anything will probably do (within reason).

Keep us posted!

Mobeetie · 15th July 2011, 00:47

Cheers Jack, thats a great help that information. Will be using this site to get the cables, to keep the wires factory colour coded to make it easier - http://www.autoelectricsupplies.co.uk/product/70.

I wish my car was like that James but unfortunately none of the cruise wiring is in my car so theres no plugging in and cruising

Thats the plan, making it up from scratch. Got the wiring diagram, a basic idea of where it goes and the route it could take, hardest parts i think will be getting through to the ECU and connecting there and possibly connecting to the ABS speed and K-Bus communication side, may have to source another clutch switch but it's been known for the standard fit brake switch to be of the correct type and swapping that for the clutch switch to work. I can see why now i've put this off for so long but after 7000 miles in just over 3 months i've decided to set about doing it

First steps to be done shortly is getting a rough idea of the length of the different colour wires needed, I will save that info and put it on here if anyone else in future wants to do this.

Using these wiring diagrams:

Parts:
Cruise ECU and Electrical connector (Connector yet to find, £10 off a breaker)
Steering wheel switches
Master Switch and electrical connector

And a bit of luck

revor64 · 8th August 2011, 20:32

Is the drawing available in a better resolution ?
This is hard to read.
( I might need it )

Jakg · 8th August 2011, 20:39

The drawing is a print-screen from RAVE.

revor64 · 8th August 2011, 21:11

Oh, hmm,
Next time I will do my homework

Stupid of me, not to look first.

Rick-sta · 7th March 2014, 12:53

Reviving an old thread here but any success in wiring the cruise control in?

Mobeetie · 7th March 2014, 21:23

I didn't take this on any further but it still remains the thing I miss most in my 75

12th July 2011, 23:17	#1
Mobeetie Loves to post MG ZT 260 SE V8 & Rover 75 CDT Connoisseur Join Date: Sep 2009 Location: Mids Posts: 288 Thanks: 3 Thanked 1 Time in 1 Post	Wire Spec. for Cruise Control A bit of an odd question but i've been slowly getting round to retro-fitting cruise, i've now got all the parts except for the cruise ECU electrical connector, now it's just the wiring I've got a diagram and a bit of an understanding where it all should go and so on but with no electrical knowledge at all i just want to see what kind of wire thickness, gauge etc to use? Thanks __________________ MG ZT 260 SE V8 - Monogram Moonshine Rover 75 CDT Connoisseur - Royal Blue

13th July 2011, 00:36	#2
Jakg This is my second home N/A Join Date: Feb 2010 Location: Suffolk Posts: 6,867 Thanks: 0 Thanked 397 Times in 302 Posts	I doubt it'll be high current, but I like using 1.5mm² wiring normally, as it's easy to route, doesn't take up much space, but is still up to taking a bit of power if it needs to. For higher-current stuff (i.e. my speakers) I use 2.5mm² - not much more expensive, but takes up a little more space. Most of the OE wiring is ~0.75mm². 0.75mm² = 18-19 AWG 1.5mm² = 15-16 AWG 2.5mm² = 13-14 AWG The size of the wire only determines how much power you can get away with passing down it - I would imagine cruise control wouldn't draw much power (i.e. it's just sending signals around) so 1.5mm² would be fine. I also use the 1.5mm² stuff over anything smaller (even for low-current stuff) because I find it easier to work with. The tiny cables you get with LED strips from China are always a ballache to crimp because they're so small... EDIT - For high current stuff obviously I use proper cable - currently using 54mm² & even 104mm² in places. Last edited by Jakg; 13th July 2011 at 00:41..

15th July 2011, 00:47	#5
Mobeetie Loves to post MG ZT 260 SE V8 & Rover 75 CDT Connoisseur Join Date: Sep 2009 Location: Mids Posts: 288 Thanks: 3 Thanked 1 Time in 1 Post	Cheers Jack, thats a great help that information. Will be using this site to get the cables, to keep the wires factory colour coded to make it easier - http://www.autoelectricsupplies.co.uk/product/70. I wish my car was like that James but unfortunately none of the cruise wiring is in my car so theres no plugging in and cruising Thats the plan, making it up from scratch. Got the wiring diagram, a basic idea of where it goes and the route it could take, hardest parts i think will be getting through to the ECU and connecting there and possibly connecting to the ABS speed and K-Bus communication side, may have to source another clutch switch but it's been known for the standard fit brake switch to be of the correct type and swapping that for the clutch switch to work. I can see why now i've put this off for so long but after 7000 miles in just over 3 months i've decided to set about doing it First steps to be done shortly is getting a rough idea of the length of the different colour wires needed, I will save that info and put it on here if anyone else in future wants to do this. Using these wiring diagrams: Parts: Cruise ECU and Electrical connector (Connector yet to find, £10 off a breaker) Steering wheel switches Master Switch and electrical connector And a bit of luck __________________ MG ZT 260 SE V8 - Monogram Moonshine Rover 75 CDT Connoisseur - Royal Blue

7th March 2014, 12:53	#9
Rick-sta This is my second home MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black Join Date: Oct 2012 Location: Norfolk Posts: 7,532 Thanks: 2,718 Thanked 2,827 Times in 1,462 Posts	Reviving an old thread here but any success in wiring the cruise control in? __________________ How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link How to retrofit heated electric memory seats with no OEM wiring in place: Link How to operate FBH and ATC via text Link How to restore cloudy projector headlights Link

7th March 2014, 21:23	#10
Mobeetie Loves to post MG ZT 260 SE V8 & Rover 75 CDT Connoisseur Join Date: Sep 2009 Location: Mids Posts: 288 Thanks: 3 Thanked 1 Time in 1 Post	I didn't take this on any further but it still remains the thing I miss most in my 75 __________________ MG ZT 260 SE V8 - Monogram Moonshine Rover 75 CDT Connoisseur - Royal Blue

13th July 2011, 01:08	#3
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	I didn't need to mess with any wires when I did mine, everything just plugged in to exiting plugs. There was one plug for the on/off switch behind the Lil panel that holds the heated seat switches, the other for the ECU was behind and beneath the panel at the the rear of the glove box. I already had the controls on my steering wheel. Once I had things plugged in it worked.. except .. The "resume" button on the steering wheel does not work.. But I can easily manage without it.. Actually I rarely use cruise, too much traffic innit.. ...

8th August 2011, 20:32	#6
revor64 Loves to post Rover 75 2.0 cdt Join Date: Jun 2011 Location: Eindhoven Posts: 391 Thanks: 14 Thanked 0 Times in 0 Posts	Is the drawing available in a better resolution ? This is hard to read. ( I might need it )

8th August 2011, 20:39	#7
Jakg This is my second home N/A Join Date: Feb 2010 Location: Suffolk Posts: 6,867 Thanks: 0 Thanked 397 Times in 302 Posts	The drawing is a print-screen from RAVE.

8th August 2011, 21:11	#8
revor64 Loves to post Rover 75 2.0 cdt Join Date: Jun 2011 Location: Eindhoven Posts: 391 Thanks: 14 Thanked 0 Times in 0 Posts	Oh, hmm, Next time I will do my homework Stupid of me, not to look first.

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