Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 12-07-2023, 08:14 PM   #1
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
More in electrical Fun, wiring the Toad

I tried to make it easy in myself by plugging into the Factory tail connector on the GMC Envoy and running the cables forward the bus from the nose of the GMC.
I t was going well until...
Both turn signals work as expected unless you press the brake pedal and then
the left turn signal lights with the brakes.

What Have I done wrong?
And the bus is not part of the equation yet. I have not made it that far.
Attached Thumbnails
IMG_2381.jpg  

jfmusic@me.com is offline   Reply With Quote
Old 12-07-2023, 08:21 PM   #2
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
Not dure of the others at the momnet.

Any thoughts please.
Attached Thumbnails
32E017EF-B40F-4796-8222-AAF5C3C33E7C_4_5005_c.jpeg   EC3AB0A7-25BE-4C60-9CBD-A3E8D28A4143_4_5005_c.jpeg  
jfmusic@me.com is offline   Reply With Quote
Old 12-07-2023, 08:48 PM   #3
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 1,826
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
I am going to read your mind now and try to figure this out.....





No, sorry, your mind is blank right now!

Your asking for help and we have no idea how you wired things up..so...
Did you make a diagram first of how you were going to connect things?

Don't take it the wrong way but the pics are almost useless because we have no idea which pic corresponds to which vehicle?

Do the bus first.
Are you running a hardwired pigtail from the bus to the toad?

If so, make your connections and verify turn, brake and running lights are in the right spot.

How are you wiring to the toad? With the hardwired tail from the bus? And then to the lite plug on the toad?

I myself like to use the magnetic tow lights from Harbor Freight. Cancels any and all lighting issues on what ever I want to tow.
ewo1 is online now   Reply With Quote
Old 12-07-2023, 08:49 PM   #4
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
From the GMC Ownwers manual

More infofrom gmc
Attached Thumbnails
Screenshot 2023-12-07 at 5.47.44 PM.png  
jfmusic@me.com is offline   Reply With Quote
Old 12-07-2023, 08:54 PM   #5
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
AS STATED... not anywhere near connected to the Bus. this is the rear GMC out port connected to the seven wire with terminal box extension and then another 7 wire with female end to go to the bus if It were ready to go.

I was testing the Pins on the Female end that would go to the bus to see if they looked correct when I found the Turn signal also lighting with the Brakes. The Terminal box is (with my Colorblind eyes) One to one colorwise , unless I did it wrong. All together possible. I just added the GMC Manual Writeup for Colors.
jfmusic@me.com is offline   Reply With Quote
Old 12-07-2023, 09:28 PM   #6
Bus Crazy
 
Join Date: Oct 2020
Location: Near Flagstaff AZ
Posts: 1,951
Year: 1974
Coachwork: Crown
Chassis: "Atomic"
Engine: DD 8V71
You might need a converter with diodes in it, like this Hopkins "dinghy" converter...or insert your own diodes to keep the brake light power from bleeding to the turn signals:

Click image for larger version

Name:	Screen Shot 2023-12-07 at 7.26.38 PM.png
Views:	1
Size:	876.0 KB
ID:	75283
rossvtaylor is offline   Reply With Quote
Old 12-07-2023, 09:31 PM   #7
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 1,826
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Your not doing anything wrong.
what is happening is that you are going from a 7 wire system (toad) to a 4 wire system (bus).

On a 7 wire you will see the results you saw when you were testing.

First thing I would do is go to this Curt Page and learn how each system works.

What I did on my bus, RE Amtran, I dropped a wire from the rear lights, installing a 4 wire flat plug and used a set of Harbor freight magnetic tow lights on my toad.

Easy, peasey!
ewo1 is online now   Reply With Quote
Old 12-07-2023, 09:59 PM   #8
Bus Nut
 
fo4imtippin's Avatar
 
Join Date: Oct 2021
Location: Jacksonville, FL
Posts: 672
Year: 2003
Coachwork: BlueBird
Chassis: TC2000 28ft
Engine: Cummins ISB 5.9 24v, MD3060
Rated Cap: 14
Quote:
Originally Posted by ewo1 View Post
Your not doing anything wrong.
what is happening is that you are going from a 7 wire system (toad) to a 4 wire system (bus).

On a 7 wire you will see the results you saw when you were testing.

First thing I would do is go to this Curt Page and learn how each system works.

What I did on my bus, RE Amtran, I dropped a wire from the rear lights, installing a 4 wire flat plug and used a set of Harbor freight magnetic tow lights on my toad.

Easy, peasey!

Yes I recommend you touch no wiring on your toad.. run your plug all the way back to a hitch rack mag lights or some $30 harbor freight led rail lights. You want to mess with less stuff, everything always ends up complex for you.. keep it simple..
fo4imtippin is offline   Reply With Quote
Old 12-07-2023, 11:10 PM   #9
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
OK, thanks, But I would think I would want a power feed to the battery on the toad and the trigger for the brake unit. Irv2

So
1 Left trn
2 rt turn
3 Brake Light
4 Brake signal
5 Power
6 backup
7 Ground

Is that not the correct theory.
I looked at Curt. But the variables do not necessarily Align. As usual.

Would You just add a diode to the Brake path? And at what point?
jfmusic@me.com is offline   Reply With Quote
Old 12-08-2023, 11:13 AM   #10
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Central Tx.
Posts: 1,826
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by jfmusic@me.com View Post
OK, thanks, But I would think I would want a power feed to the battery on the toad and the trigger for the brake unit. Irv2

So
1 Left trn
2 rt turn
3 Brake Light
4 Brake signal
5 Power
6 backup
7 Ground

Is that not the correct theory.
I looked at Curt. But the variables do not necessarily Align. As usual.

Would You just add a diode to the Brake path? And at what point?

Power feed to the battery is really not required. More of a wish list versus "I need to have it"!

The power wire is for powering electric brakes and yes, if you have extra equipment on your trailer that does not have a way of charging itself, then you would use the power wire to charge that equipment.


And how are you going to power the brakes on the toad?
You need to add a brake controller to the bus/toad?

More wiring that needs to be done and planned ahead!

Keep it simple!

I toad a 2010 chrysler sebring with my bus using a retired u-haul tow dolly From Miami to Central Tx, no issues at all. I wired in a 4 wire flat plug, splicing them directly to the wires on each lamp. Very easy, very straight forward!

You already have had enough electrical excitement, I would keep it simple.

https://www.curtmfg.com/towing-elect...iring#Diagrams

Go to this Curt page and study the wiring for 4 wire and 7 wire. Note the differences in the wiring.
ewo1 is online now   Reply With Quote
Old 12-08-2023, 11:45 AM   #11
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 338
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
I grabbed a used RVi2 Braking system... A Blueox Steel towbar and undercarriage attachment. And now we need to repair the front suspension of the GMC, which dropped a bushing on the lower control arm this week, so that is getting ripped apart this week as soon as the parts come in. Never fails, always one more thing in the way.

The bus is 85% full as the moving van I expected it to be for the drive to the New local. It will be 90% shortly. Doing everything I can to load balance, keeping the weight near the floor and Load-ocking so it doesn't still around too much.

Yes, I am electrically challenged; comes from having a father and brother who were both in electronics and my being colorblindish. They dealt with it with me over their shoulders watching. Now I struggle. And as usual thank you for all the help. And Happy Holidays to verybody.
jfmusic@me.com is offline   Reply With Quote
Old 12-08-2023, 01:33 PM   #12
Bus Nut
 
nikitis's Avatar
 
Join Date: Jun 2023
Location: South Carolina
Posts: 795
Year: 1995
Coachwork: Thomas
Chassis: International 3800
Engine: T444E
Rated Cap: 29
I built a 12k trailer from scratch and just went through all of this process with 7 wire.

If the source (Your GMC) is a 7 wire hookup, go 7 wire all the way. The (Brake) wire will not be used unless you have a curt trailer package installed on the GMC. Even if you have them on the trailer, they won't work if you hook it up. It won't hurt it but they won't be used. Everything else is a 1:1


I used this video to make sense of how to wire the trailer or whatever it is you are wiring up. Just pause the video and do each wire up at a time, then come back to the video and do the next wire setup. Translate the diagram to whatever trailer or back tow item you are wiring.



https://youtu.be/u1c0OPawJlc

"Trialer brake" as listed in that video is the one requiring a kurt package and can be ignored if not using one of those installed in the GMC. "Stop light" is the rear braking light in the video.



If at the end you have weird issues still, then check the fuse boxes. I had a bad fuse on my truck when I first wired up my trailer and had a brake/blinker issue as well, and it was a short on the fuse. I replaced it and it worked fine after that.
nikitis is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.