โMay-23-2017 04:40 PM
โMay-24-2017 05:08 PM
โMay-24-2017 04:14 PM
dougrainer wrote:
WHAT is the voltage at the front 7 way Bargman. What is the voltage at the other Tailight or any of the clearance lights? Garbage IN Garbage out. If the input is below 12 volts, then you have something wrong with your truck/tow supply. The VOLTAGE at all your lights comes from your Tow vehicle. NOT from the RV. You should have at minimum 13.1 volts with tow vehicle running at all lights. Doug
โMay-24-2017 12:23 PM
โMay-24-2017 12:19 PM
โMay-24-2017 11:37 AM
โMay-24-2017 11:04 AM
โMay-24-2017 09:50 AM
Last Train wrote:Artum Snowbird wrote:
OK.. to be clearer perhaps... and this might make more sense. If you are looking at a double filament bulb, one is for the brake/turn and the other is for the running light. There will be two feeds to the bulb, hot for the brake, and a hot for the run. There is no negative in the fixture, only a ground. So, my estimate of what you are measuring might be the voltage drop across the two filaments.
Have you taken the lens cover off yet to see what is going on with the actual filaments?
Yes, absolutely. All of this has been done with the lens cover removed and the positive and negative wires exposed as they emerge from inside the back wall of the trailer. I am looking at the source of the power from the wiring harness itself.
Coachmen has provided a positive black wire and a negative green wire (green is a non-standard color in this application, isn't it?). And there is a very short white wire - which I mistakenly ignored in the past - which appears to attach to the base of the bulb socket. Should this be the ground?
I've got to run to an appointment in a few minutes, but when I get back on task I will post a picture that will surely be worth the proverbial "1000 words."
Thanks again.
โMay-24-2017 07:53 AM
โMay-24-2017 07:43 AM
Artum Snowbird wrote:
OK.. to be clearer perhaps... and this might make more sense. If you are looking at a double filament bulb, one is for the brake/turn and the other is for the running light. There will be two feeds to the bulb, hot for the brake, and a hot for the run. There is no negative in the fixture, only a ground. So, my estimate of what you are measuring might be the voltage drop across the two filaments.
Have you taken the lens cover off yet to see what is going on with the actual filaments?
โMay-24-2017 07:41 AM
Artum Snowbird wrote:
OK.. to be clearer perhaps... and this might make more sense. If you are looking at a double filament bulb, one is for the brake/turn and the other is for the running light. There will be two feeds to the bulb, hot for the brake, and a hot for the run. There is no negative in the fixture, only a ground. So, my estimate of what you are measuring might be the voltage drop across the two filaments.
Have you taken the lens cover off yet to see what is going on with the actual filaments?
โMay-24-2017 07:14 AM
โMay-24-2017 07:05 AM
Artum Snowbird wrote:
You basically did the right measurement and found the problem indirectly. When you measured the voltage across the light bulb filament itself, if your grounds were good, you would see the entire voltage dropped across one filament. When you read 10.4, that means the remaining voltage in the circuit is out there somewhere... and it is in the heavy brake/turn filament as I said. Measure the voltage across the brake turn filament. You will see it is half of the remaining voltage (13.6 - 10.4 = 3.2 1.6 on the brake/turn filament in that bulb, and 1.6 across the brake/turn filament on the other side of the vehicle.
โMay-24-2017 06:27 AM
โMay-24-2017 12:32 AM