Tow Bar Electrics
#1
I did this to my 735iL (E38) BMW support / DD vehicle.
Power to the relay bank is permanent and fused; coils are activated by the appropriate car circuit. Output is to the socket on the tow-bar.
When future maintenance/fault finding is required how do you know what does what? Easy - The colour of the output wire.
Two major advantages of this system:
1) Trailer electrical load cannot overload flasher units and other switch contacts.
2) A trailer fault will only blow the fuse in the relay - towing vehicle still works OK.

The relays for my application were mounted in the boot (trunk) behind the battery.


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#2
Now that is quite the electrical connection for towing!
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Current Mustangs:
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1971 Mustang Grande
1965 Mustang
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#3
Maybe that is why my ex used to call me 'OK Salmon' - OK = Over Kill.

It would have looked neater if I had used that black spiral wrap stuff along the bottom. That would divide up the wires to each relay.

Over kill? Don't know what you mean.
                                   
___________________________________________________________
                                    Good; Fast; Cheap.  Pick any two.
                                    The best mechanic you know holds the steering wheel when you drive  Thumbsup
                                     Current Rides:
                                     The Daughter's '70 Mach 1.  Nana
                                     My: 3 x E32; 2 x E38; X5 BMWs; 2 x BMW MINIs (R50 & R55);
                                     Daimler Sovereign(s)  S1 and X40     Cool
                                     Parts car:  E38 Confused    
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#4
(01-15-2016, 12:30 PM)Mach1FatherFigure Wrote: Maybe that is why my ex used to call me 'OK Salmon' - OK = Over Kill.

It would have looked neater if I had used that black spiral wrap stuff along the bottom. That would divide up the wires to each relay.

Over kill? Don't know what you mean.
Over kill, i think not. That is exactly the correct way. As a ford tech through the 80's,90's and early 2000's I have seen many trailer wiring faults. Some resulting in dashboard fires. Ford gave people the correct wiring harness to wire a trailer. Still. Thanks to the quick blue jumper connector many vehicles suffered unneeded wire repairs all due to incorrect trailer wiring. Great job for doing it correctly. regards John
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#5
Thanks for the kind words, John
                                   
___________________________________________________________
                                    Good; Fast; Cheap.  Pick any two.
                                    The best mechanic you know holds the steering wheel when you drive  Thumbsup
                                     Current Rides:
                                     The Daughter's '70 Mach 1.  Nana
                                     My: 3 x E32; 2 x E38; X5 BMWs; 2 x BMW MINIs (R50 & R55);
                                     Daimler Sovereign(s)  S1 and X40     Cool
                                     Parts car:  E38 Confused    
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#6
I have now done the same to my Daimler Sovereign.
The main (only?) use will be towing the TRAIMLER, so overkill again.
I don't care it will be safe and long term reliable. I also used the slightly over-sized power wire to feed a socket in the boot (trunk) that will run a 12v kettle, lights, charge a phone etc..
It is fused at the supply point (firewall) by an in-line fuse.
                                   
___________________________________________________________
                                    Good; Fast; Cheap.  Pick any two.
                                    The best mechanic you know holds the steering wheel when you drive  Thumbsup
                                     Current Rides:
                                     The Daughter's '70 Mach 1.  Nana
                                     My: 3 x E32; 2 x E38; X5 BMWs; 2 x BMW MINIs (R50 & R55);
                                     Daimler Sovereign(s)  S1 and X40     Cool
                                     Parts car:  E38 Confused    
Reply
#7
Sounds like you're having fun. JTS
"We built these cars to drive the "HELL" out of them, not to be museum pieces!"  Carroll Shelby

2008 Mustang V6 5 speed "Diablo Sport Predator" tuner, 87 octane tune. WOW!
1994 Ford F150 Shortbed
1986 Honda 450 Rebel
1995 Honda Pacific Coast
1989 Jacobra / Jag xjs
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#8
If it isn't fun I don't do it any more. Too old to waste my time.
I have a much younger female friend who wants to learn how to look after her car and how it works.
We flirt outrageously but I would not 'touch' her as that would ruin the fun we have fixing her and my cars as she learns. She drives one of my 'club' cars to shows regularly, usually with her squeeze. Show days are a real hoot. Especially now I have my 'show' trailer to cart the BBQ etc.
See my first sentence.
                                   
___________________________________________________________
                                    Good; Fast; Cheap.  Pick any two.
                                    The best mechanic you know holds the steering wheel when you drive  Thumbsup
                                     Current Rides:
                                     The Daughter's '70 Mach 1.  Nana
                                     My: 3 x E32; 2 x E38; X5 BMWs; 2 x BMW MINIs (R50 & R55);
                                     Daimler Sovereign(s)  S1 and X40     Cool
                                     Parts car:  E38 Confused    
Reply
#9
Sounds Great! I wish I was to that point about 7 1/2 years away. Then were on my time! JTS
"We built these cars to drive the "HELL" out of them, not to be museum pieces!"  Carroll Shelby

2008 Mustang V6 5 speed "Diablo Sport Predator" tuner, 87 octane tune. WOW!
1994 Ford F150 Shortbed
1986 Honda 450 Rebel
1995 Honda Pacific Coast
1989 Jacobra / Jag xjs
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