Wiring 72 FLH
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,604
Likes: 3,375
From: Cental, MI
All that "stuff" to maybe prevent run on...and Maybe Not... Only time I ever actually experienced Run On, was a Friend who insisted he did Not need a new Battery, and due to low Voltage, welded the Washer in the solenoid... I do Not see how the same situation would not occur with the "relay" shown, which is basically the same "washer" setup..
What am I missing here???
to go with this... I have never had a bosch relay "stick", and I have many times used the normally closed "loop" in the bosch to run the Lighting circuit [on lights on always applications]
Edit to add, This
Tells me a Harness is a waste of time and money... Wire it up like an FX sans Signals... Or use one of the Untold Hundreds of "chopper" schematics... even Cartoons if that is your skill level...
What am I missing here???
to go with this... I have never had a bosch relay "stick", and I have many times used the normally closed "loop" in the bosch to run the Lighting circuit [on lights on always applications]
Edit to add, This
Tells me a Harness is a waste of time and money... Wire it up like an FX sans Signals... Or use one of the Untold Hundreds of "chopper" schematics... even Cartoons if that is your skill level...
Last edited by Racepres; May 10, 2019 at 07:09 AM.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
the left side of the board has the bosch realy and I also to the right of it is the early first edition relay for originality as its seen on a real piece the rest is not seen
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
All that "stuff" to maybe prevent run on...and Maybe Not... Only time I ever actually experienced Run On, was a Friend who insisted he did Not need a new Battery, and due to low Voltage, welded the Washer in the solenoid... I do Not see how the same situation would not occur with the "relay" shown, which is basically the same "washer" setup..
What am I missing here???
to go with this... I have never had a bosch relay "stick", and I have many times used the normally closed "loop" in the bosch to run the Lighting circuit [on lights on always applications]
Edit to add,
Tells me a Harness is a waste of time and money... Wire it up like an FX sans Signals... Or use one of the Untold Hundreds of "chopper" schematics... even Cartoons if that is your skill level...
What am I missing here???
to go with this... I have never had a bosch relay "stick", and I have many times used the normally closed "loop" in the bosch to run the Lighting circuit [on lights on always applications]
Edit to add,
Tells me a Harness is a waste of time and money... Wire it up like an FX sans Signals... Or use one of the Untold Hundreds of "chopper" schematics... even Cartoons if that is your skill level...
you live a charmed life --- enjoy it - embrace it - while the rest suffer through the evils of reality
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,604
Likes: 3,375
From: Cental, MI
Enlightenment please..
Snide don't work on me...
Edit to add; This
is something I would consider if I were that scared of run on... and there have been times I wish I would have had it that had Nothing to do with run on... we're talking bonehead moves... like getting the "hot" wire between the chassis and the Lift..... OOOOPs!!!
Last edited by Racepres; May 10, 2019 at 09:26 AM.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
Pretty much what I have been doing but left out the ford solenoid....( you have it in drawing as a relay ). I think if I was doing a restoration it would be your way as we can hid bosh style relay. Never thought about electric start only ones. The one time I had one hang I kicked it loose. Thanks for drawings.....not new to this stuff but like too see others take on it.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
ok I get what you did and yes like I said some never do it BUT - I have had them come to the shop 1/2 burnt to the ground when this happened and no tools handy - no kicker to over ride it - and no way to remove the seat - then having a new AGM battery and thats all that is needed to loose the bike
its a safety thing not one electric start restoration we have done in 20 plus years leaves the shop with out having it wired this way
I am doing one right now a self repaired wire harness 1972 that the guy did not think he needed the neutral switch
well it stuck the trans was in first gear the bike was chained to the wall - he stuck a metal bar in the spokes to stop it - it broke the chain that in turn tore the chain guard off the bike and snapped 3 spokes it melted a couple wires
THE bike was marvin gays bike - we have pictures of it with big daddy ed roth after he had it painted by him in the 70s - 5 dimension's deep in 7 colors and the dominate color is blue - cant get how he did it but he was ed roth that's how
its a safety thing not one electric start restoration we have done in 20 plus years leaves the shop with out having it wired this way
I am doing one right now a self repaired wire harness 1972 that the guy did not think he needed the neutral switch
well it stuck the trans was in first gear the bike was chained to the wall - he stuck a metal bar in the spokes to stop it - it broke the chain that in turn tore the chain guard off the bike and snapped 3 spokes it melted a couple wires
THE bike was marvin gays bike - we have pictures of it with big daddy ed roth after he had it painted by him in the 70s - 5 dimension's deep in 7 colors and the dominate color is blue - cant get how he did it but he was ed roth that's how
I am guilty of simply wiring no nothing......but never for a customer....
Stellar HDF Member
Joined: Jan 2013
Posts: 2,747
Likes: 419
From: Vermont
But... you have not addressed my concerns that either relay or Solenoid of that type can weld Shut... which creates run on.. I can see the Solenoid in your deal cannot run on without the relay... but... a stuck relay is same same..
Enlightenment please..
Snide don't work on me...
Edit to add; This
is something I would consider if I were that scared of run on... and there have been times I wish I would have had it that had Nothing to do with run on... we're talking bonehead moves... like getting the "hot" wire between the chassis and the Lift..... OOOOPs!!!
Enlightenment please..
Snide don't work on me...
Edit to add; This
is something I would consider if I were that scared of run on... and there have been times I wish I would have had it that had Nothing to do with run on... we're talking bonehead moves... like getting the "hot" wire between the chassis and the Lift..... OOOOPs!!!Last edited by Bumpandrun; May 10, 2019 at 09:52 AM.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,604
Likes: 3,375
From: Cental, MI
Yea... the bit of security [small bit] is something I do Not require... but... others have utilized that part as well...
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
your switch does the same thing as the way I wire the collectables BUT to me it looks stupid on a real restored machine - BUT the ford type relay is a 50 amp unit USA made and the small box relays are said to be 30 so the amount of copper one to the other is what we looked at
the large amount of copper windings in the ford unit snap the current to the starter - and too me the starter turns faster right off the bat
also the heat attributed to the connection is greatly reduce ( your switch does nothing to prevent any of this ) 2 things happen ( you can believe what you want you have a set way of doing things I get it ) the connection gets greater amps in the beginning snap from the ford relay and this gets the mechanism spinning faster at the start - simple you have your way I have mine
the large amount of copper windings in the ford unit snap the current to the starter - and too me the starter turns faster right off the bat
also the heat attributed to the connection is greatly reduce ( your switch does nothing to prevent any of this ) 2 things happen ( you can believe what you want you have a set way of doing things I get it ) the connection gets greater amps in the beginning snap from the ford relay and this gets the mechanism spinning faster at the start - simple you have your way I have mine