Need your thoughts

Energy One
carpetman

carpetman

Member
Good morning to all, I finaly got my side covers off tks to Shane and now I'm ready to do some wireing. I'm really scared for my ECM I already changed it out ( Really was my fault ( loose ground cable at Batt;:loony:pS ALWAYS DO A CHECK LIST BEFOR EVERY RIDE :up:) I'll be wireing 3 solenoids, a fuel pump, 3 switches, a nitrous pressure gauge, a oil pressure gauge, gauges have sending units and all switches and gauges are lighted. I know its a lot of work and I guess what I need advice on is the switch controled power. I need power when motor is running only. Is there a really safe place to get this power without messing with the ECM:confused: also when I took off my side covers theres a block of some sort above the horn that has a power lead from the batt. and a black going ?. What is this I have a 2007 K9. Please chime in with any thoughts. I really learn alot from everyone and you have saved me lots of headaches TKS IN ADVANCE:2thumbs::2thumbs:
 
PurpleDog

PurpleDog

Well-Known Member
Disclaimer; I haven't done what you're doing and I wouldn't be surprised to stir up some warnings with what follows....

As you probably know, the EHC is basically a fancy ground switch; providing pwr over 2 internal buses with fault protection. Are you planning to try and utilize the EHC for solenoid and light pwr/control or by-pass it?
Do you have the service manual with schematic, pin outs and description. What type of lighting does the gauge have (LED or incandescent) and resulting current draw?
If LED in the gauges, I would think tapping into run lights is a possibility, remember ground should ground through EHC vs chassis. The EHC provides auto over current protection on both buses and throw fault if overloaded.
Do you have a sense for fuel pump current? The fuel pump on an EFI bike is fed from a separate EFI controller providing power through a relay. Are you planning to feed the pump via direct battery pwr similarly through a relay/solenoid by-passing the EHC? Are you going to trigger the solenoid via EHC pwr output?
 
BBChopper

BBChopper

Supports 2 Disabled Vets
Troop Supporter
You’re basically looking for a “Switched” power source? I think you’re out of luck. Be careful!!!

May be able to use a relay and trigger from the headlight? Still be careful!
 
carpetman

carpetman

Member
yes, I'm really looking for a switched power supply from the bike inself. I can run all power from a remote switch but you know how that is, might forget to turn if off. Would a direct frame ground bypass the EHC? PurpleDog got me wondering
 
PurpleDog

PurpleDog

Well-Known Member
carpetman said:
yes, I'm really looking for a switched power supply from the bike inself. I can run all power from a remote switch but you know how that is, might forget to turn if off. Would a direct frame ground bypass the EHC? PurpleDog got me wondering
Click to expand...
This is why I am asking if you have the Service Manual with Schematics of both carb and EFI models so as to be sure we are looking at the same thing. I think you could switch a relay off the EHC while providing pwr to fuel pump directly off battery +.

If you have the schematics, look at how the EFI bike does this...the relay pwr should be low control to switch the relay to feed pwr from battery imo.
 
carpetman

carpetman

Member
I do not have a service manual, I have the carb,model 07 K9. Everytime someone mentions the EHC I start shaking I can run everything from just a power source and a ground I really don't want my EHC involved. TKs for your thoughts
 
PurpleDog

PurpleDog

Well-Known Member
carpetman said:
I do not have a service manual, I have the carb,model 07 K9. Everytime someone mentions the EHC I start shaking I can run everything from just a power source and a ground I really don't want my EHC involved. TKs for your thoughts
Click to expand...
Ok, I'm aware you have a carb bike...:up: I was hoping you had the same schematic(s) I am looking at. I know some have been posted here several times (not sure if EFI model was right off). I could have scanned that for you to see what I am talking about; but since you aren't interested in playing with EHC controlled possibilities, I'll let it go. I'm in the garage myself today anyway, take a look at the posted schematics and hope you get your wiring plan sorted out...:up:

:cheers:
 
carpetman

carpetman

Member
Jim, thanks for your time and thoughts on my questions, one more if I ground to frame is there any way the EHC can tell, ( This sounds silly even to me ) But I'm not to proud to ask $$$. Thanks again
 
PurpleDog

PurpleDog

Well-Known Member
carpetman said:
Jim, thanks for your time and thoughts on my questions, one more if I ground to frame is there any way the EHC can tell, ( This sounds silly even to me ) But I'm not to proud to ask $$$. Thanks again
Click to expand...
I don't believe so; the EHC is switching ckt's to ground to complete a ckt path. If it were me, I'd consider using the Air Ride solenoid ckt to control the nitros if I didn't already have air ride personally. That way the switch is built into the factory wiring/switch. Hit the HI beam and hang on sort of thing.....:D
I was just trying to help you get it done trick without a bunch of crap you might not need wired in ya know... Several ways to accomplish the task man.
 
PurpleDog

PurpleDog

Well-Known Member
carpetman said:
theres a block of some sort above the horn that has a power lead from the batt. and a black going ?. What is this I have a 2007 K9. Please chime in with any thoughts. I really learn alot from everyone and you have saved me lots of headaches TKS IN ADVANCE:2thumbs::2thumbs:
Click to expand...
I am looking at mine right now; that is your circuit breaker. Look on the bottom of it you will see the reset button.
 
PurpleDog

PurpleDog

Well-Known Member
So my air ride compressor is grounded directly to battery; the power is from EHC A2 blue wire. That means you could possibly activate your NOS solenoid with the Hi/low beam switch using blue wire under right side cover versus having separate NOS switch. A relay seems like it would work to activate your fuel pump off same switch - drawing pwr directly from battery and grounded to battery imho. But hey, I've got a WirePlus sitting here in case I ever need it too....:D

Air solenoid is blue A18 which is within an accessory harness with smaller gauge wire pair that has ground with it whereas A2 plug above is not.

Both drawing pwr through EHC bus 1.

----------
Do you live in a state that requires safety inspection; iow, do you really need that horn? Maybe you'd consider using the horn relay ckt for similar solution as to above but using horn button.
 
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DRBarnhart

DRBarnhart

Insert title here...
carpetman said:
I'll be wireing 3 solenoids, a fuel pump, 3 switches, a nitrous pressure gauge, a oil pressure gauge, gauges have sending units and all switches and gauges are lighted. I know its a lot of work and I guess what I need advice on is the switch controled power. I need power when motor is running only.
Click to expand...
I'll show my stupidity here and ask... what do the 3 solenoids, fuel pump, and switches do? And did the manufacturer give you a wiring diagram with it?

I ask because it may give a better idea of how much power you need and the best way to get it without sending the EHC tits up! Outside of the stock equipment there's not much I'd add to the EHC as an electrical load...

Dennis
 
chacha

chacha

Chaff Your EHC!!
Calendar Participant
Back when I had an EHC (while I was waiting for it to f'n die), I had a separate switched circuit--grounded to the frame like a normal bike and powered from the battery. After the bike was fired up, I'd turn on the second circuit for additional lights and powered horn. Never had a problem. Personally, I'd never tap a BDM EHC circuit for power - damn thing is too unstable.
 
PurpleDog

PurpleDog

Well-Known Member
My BDM air compressor is 10.5 Amps run through the EHC; I wouldn't be surprised if fuel pump is less, but then again I wasn't suggesting taking that draw through the EHC but rather pwr for switched relay...Take a look at how the fuel pump is wired/controlled on an EFI bike.
I wouldn't be scared to use either the horn or air ride ckt through the EHC to control relays/solenoid....

Chickens.....:D
 
carpetman

carpetman

Member
Ok, Back from the stores again, Great responses from you guys and a lot of ideals to think about. The three solenoids are NOS, Fuel, and NOS purge. The 3 switches that I had in mind are 1 for arming, 1 for fuel and 1 for purge. I'm going to activate the nitrous at full throttle with a micro switch. The 2 gauges are NOS and oil pressure both using sending units. Thanks for some more ideals with the hige beam and air ride connections
 
BBChopper

BBChopper

Supports 2 Disabled Vets
Troop Supporter
chacha said:
Back when I had an EHC (while I was waiting for it to f'n die), I had a separate switched circuit--grounded to the frame like a normal bike and powered from the battery. After the bike was fired up, I'd turn on the second circuit for additional lights and powered horn. Never had a problem. Personally, I'd never tap a BDM EHC circuit for power - damn thing is too unstable.
Click to expand...

Did you have an Andreas Fault?:eek::roll::roll:
 
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