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Topic: Hooked up trailor now NO BRAKE OR DASH LIGHTS! (Read 511 times) previous topic - next topic

Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Hey everyone,
 Went to hook up trailor last night and learned that the connection was outdated. I found the right connection material and put together an adapter.
 I hit the lights last night and the dash lights immediately went out and no brake lights! I checked the fuses this morning and they are fine. IDEAS??
1994 U240 3116 Cat 6 speed Allison transmission

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #1 –
<Snicker>

You fixed something?  Shame on you.

Seriously, look for the dashboard ground and check that out.

Check for power at the headlight and brake switches too, but the likely suspect is a bad ground.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #2 –
Quote from: Old Toolmaker –
<Snicker>

You fixed something?  Shame on you.

Seriously, look for the dashboard ground and check that out.

Check for power at the headlight and brake switches too, but the likely suspect is a bad ground.
I have headlight power just no tail lights (or rear marker lights) signal lights are good as brake lights. Just no dash or panel lights. :(
1994 U240 3116 Cat 6 speed Allison transmission

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #3 –
Disconnect trailer connection. Troubleshoot to ensure coach lighting woks first, then the following. Use Multimeter and check that power to connection matches the lights on coach. (Trailer connector on coach--- brake lights work and pin on connector shows 12V, clearance lights work and pin on connector shows 12V. and continue to all pins). Ensure trailer connector ground pin does not connect to any power connection from/to trailer.
Future Foretravel Owners
2019 Jeep Cherokee Trailhawk
Retired USAF, Retired DOD Civ's
FAA A&P, Indust. Eng., Acft Depot Lvl. Maint.
Larry and Becky Rountree

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #4 –
Quote from: master2301 –
Disconnect trailer connection. Troubleshoot to ensure coach lighting woks first, then the following. Use Multimeter and check that power to connection matches the lights on coach. (Trailer connector on coach--- brake lights work and pin on connector shows 12V, clearance lights work and pin on connector shows 12V. and continue to all pins). Ensure trailer connector ground pin does not connect to any power connection from/to trailer.
Clearance lights don't work. I'll have to get a voltmeter and play around with it.
 I'm also waiting for a call back from Tech Support.
1994 U240 3116 Cat 6 speed Allison transmission

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #5 –
All lights go through your headlight switch. I would start there.
1994 U280, Build 4490
Deming, NM.
 

Re: Hooked up trailor now NO BRAKE OR DASH LIGHTS!

Reply #6 –
As a second thought, curious of what kinda trailer braking system if one is used. Is it air system or electric? If electric, is trailer braking power wiring compatible with coach wiring?
Future Foretravel Owners
2019 Jeep Cherokee Trailhawk
Retired USAF, Retired DOD Civ's
FAA A&P, Indust. Eng., Acft Depot Lvl. Maint.
Larry and Becky Rountree