No signal lights, headlights, docking lights, fog lights

OK,
Had to head out of town and finally got back to look at this.

When I got back the chassis battery was almost completely dead - 10.7 V. The batteries were old and so I went and replaced them. What do you know - everything is back working. Very very odd to say the least. I'm wondering if the batteries were just so completely dead they caused issues . . .

Anyway, thanks everyone for the help.

dvleemin wrote:
So yesterday I was about to leave on a trip and started up my 2005 Itasca Horizon 40ad and the signal lights, brake lights, docking lights all don't work. So I went to the fuse panel for the chassis and there's no burnt out fuses, and none of the pop out breakers are tripped. Given that a bunch of lights aren't working, I have to believe its a common power supply issue - maybe a primary breaker. But I cannot find it or figure it out. Does anyone have any ideas?

Thanks,

Darryl

SO did u ever figure out the problem?

fcooper wrote:
I think it could be the ignition relay.

I copied this statement from a post by Wolfe10 from April 2008
"Many coaches use an ignition relay so all things that work only when the ignition is on do not have to run through the ignition switch. They are a failure item."

I suggest you find the relays and try swapping them if they are all the same number. (They were the same number on my 2000 Freightliner).

My relays/fuses were in a storage bay below the drivers' feet, and Freightliner put relays and fuses in the same box.

You can also get help from the Freightliner help desk (free). 1 800 FTL HELP

Have the last 6 digits of your vin number when you call. They can read your coach's wiring diagrams and suggest common points of failure.

Fred

I have never seen any ignition relay stop the headlights from operating. Headlites about almost 100% of the time work as long as the main disconnect is not off. same goes for the 4 way flashers

I kind of wonder about this post. Is the problem with the coach or not reading the factory supplied manual for the coach. Winnebago Ind., has an owners manual on line for your rig and a schematic that list what does what. The owners manual give the location of fuses and breakers and the schematics show point to point wiring. Can be confusing, but, between the two, it say what and wher.

I think it could be the ignition relay.

I copied this statement from a post by Wolfe10 from April 2008
"Many coaches use an ignition relay so all things that work only when the ignition is on do not have to run through the ignition switch. They are a failure item."

I suggest you find the relays and try swapping them if they are all the same number. (They were the same number on my 2000 Freightliner).

My relays/fuses were in a storage bay below the drivers' feet, and Freightliner put relays and fuses in the same box.

You can also get help from the Freightliner help desk (free). 1 800 FTL HELP

Have the last 6 digits of your vin number when you call. They can read your coach's wiring diagrams and suggest common points of failure.

Fred

hostage wrote:

jjjandrbaker wrote:
I had the same problem in my last camper. I hitched up, plugged in, and nothing. The man at the site next to me said to unplug the power cord and blow into it. I did. It worked. Worth a try?????

what would that have to do with persons 40 ft motor home that the brake and turn and headlites quit working?

My bad! Flew through all the posts too fast this morning. Missed that it was a motor home. Apologies!

dvleemin wrote:

hostage wrote:
but as asked all your park;;tail;;run lights all work?

Tail lights don't work - basically anything controlled by the headlight switch doesn't work (along with signal lights, docking lights, fog lights).

ok great need to have the whole story not 1/2 or 3/4 LOL;Iam agreeing with others where a master ground connection maybe bad
WHAT I WOULD DO RIGHT NOW is take a test light and see if u have power to the signal fuse and to the headlights;; IF you DO then run a dummy ground wire to one of the headlights and see what happens
that will be the proof in the pudding:: if NO power then its as I suggested a power supply relay solenoid bad somewhere

Check them both. Drawing show several ground blocks all in the power cord compartment. To me it is saying where the power cord is stored.

dvleemin wrote:

1995brave wrote:
You may have lost the ground which looks to be labeled "TP" 14awg White wire going to the chassis connector on pin "E". Turn on all the lights and what is not working marker, brake , turn, etc. According to the drawings you have a ground block(all white wires) in the power cord compartment. Start there and look for a wire broken, chewed through, etc. Located in the body 12volt wiring diagram.

Thanks!

By power cord compartment do you mean where the shore power connection is? Or where all the chassis fuses are?

I'm assuming this is it:

1995brave wrote:
You may have lost the ground which looks to be labeled "TP" 14awg White wire going to the chassis connector on pin "E". Turn on all the lights and what is not working marker, brake , turn, etc. According to the drawings you have a ground block(all white wires) in the power cord compartment. Start there and look for a wire broken, chewed through, etc. Located in the body 12volt wiring diagram.

Thanks!

By power cord compartment do you mean where the shore power connection is? Or where all the chassis fuses are?