Community Forums

Stan&Jacquie · 04-25-2022, 01:47 AM

Greetings: I’m still looking for chassis wiring diagrams for my 2007 Knight. Specifically needed is for turn signals and marker lights.

Problem: short in turn signal circuit. Left signal comes on but won’t flash; right signal is normal. If I pull the fuse to left signal, the signal flashes normally! Marker lights are out completely. Suspect the two problems might be related.

Any help would be most appreciated. Cannot drive at night with no marker lights. Headlamps work but rear of Coach is completely dark.

YC1 · 04-25-2022, 07:57 AM

Address the simple issue first and the second difficult/strange problem may go away.

Chasing the problem with the marker lights should be straight forward.

Power and ground to them. Pick one at ground level and pull it out so you can access the wiring.

Make a good ground with a length of wire for your voltmeter or better yet, a test light.

Check the hot and ground sides of the marker light.

Connect the ground wire of your test light to battery +. Then poke each wire of the marker light.

If you have a good ground, the test light should come on at full brightness. Test this at the battery first for a good comparison.

Then take that test light that has twelve volts on it and connect it to the hot side of the marker light. The light should come on but much dimmer than normal.

IF the marker light does not come on with that setup after checking the ground then put an inline fuse in that ground wire you made and touch it to the hot side of the marker light. Things should light up but if not the bulb/light is bad but not likely you have all of them bad. Multiple lights out is not unusual though.

Once you have sorted the marker light issue by finding a bad ground for example the other problems may go away.

Always fix the obvious/simple problem first. Your head could explode trying to wrap around sneak paths caused by bad grounds.

Stan&Jacquie · 04-25-2022, 07:17 PM

Quote:

Originally Posted by YC1

Address the simple issue first and the second difficult/strange problem may go away.

Chasing the problem with the marker lights should be straight forward.

Power and ground to them. Pick one at ground level and pull it out so you can access the wiring.

Make a good ground with a length of wire for your voltmeter or better yet, a test light.

Check the hot and ground sides of the marker light.

Connect the ground wire of your test light to battery +. Then poke each wire of the marker light.

If you have a good ground, the test light should come on at full brightness. Test this at the battery first for a good comparison.

Then take that test light that has twelve volts on it and connect it to the hot side of the marker light. The light should come on but much dimmer than normal.

IF the marker light does not come on with that setup after checking the ground then put an inline fuse in that ground wire you made and touch it to the hot side of the marker light. Things should light up but if not the bulb/light is bad but not likely you have all of them bad. Multiple lights out is not unusual though.

Once you have sorted the marker light issue by finding a bad ground for example the other problems may go away.

Always fix the obvious/simple problem first. Your head could explode trying to wrap around sneak paths caused by bad grounds.

YCI: cant thank you enough for a clear, well stated set of instructions that even i can follow. will tackle this next week.

stan

l1v3fr33ord1 · 04-25-2022, 07:32 PM

Stan-

Some folks have found that symptoms like yours originate at the trailer hitch connector. Water gets in there and causes short circuits and corrosion. There usually are one or two multi-pin connectors immediately upstream of the hitch connector. If so, it might be worthwhile disconnecting those to see if the symptoms go away.

After you follow Myron's procedure, of course.

doublechevy · 04-25-2022, 11:12 PM

does this help

not sure if attachment loaded or not

doublechevy · 04-25-2022, 11:19 PM

a different one to look at

veraken · 04-26-2022, 05:53 AM

Here's a link for 2007 Signature which may help.

https://www.irv2.com/forums/download...do=file&id=319

Stan&Jacquie · 04-28-2022, 11:41 AM

Quote:

Originally Posted by l1v3fr33ord1

Stan-

Some folks have found that symptoms like yours originate at the trailer hitch connector. Water gets in there and causes short circuits and corrosion. There usually are one or two multi-pin connectors immediately upstream of the hitch connector. If so, it might be worthwhile disconnecting those to see if the symptoms go away.

After you follow Myron's procedure, of course.

Another good idea. Waiting until I get home to try these ideas. I would love to fix this by myself instead of paying a shop to diagnose at $200/hr!

Thank you again.