Electrical Wire Identification

dougrainer wrote:
I can gurantee that the Norcold 12 volt supply line is NOT 10 gauge. Since the 12 volt for your year Model Norcold is just for operating the refer electronic controls, odds are the supply gauge is 16/14 gauge. But, it will NOT be larger than 14 gauge. Doug

That's the bottom line - Bad install on Dad's refer. Correct the wiring and move on, sure he could go back to the installer...

Makes one what else is not correct, insulation, air clearance, support, etc.

Sounds like a good possibility.

I wondered if GLY could be Galley.

They look like factory circuit numbers. Circuit 150 is a factory ground. Circuit 603 is some kind of lamps circuit(I haven't figured out the GLY abbreviation).

I can gurantee that the Norcold 12 volt supply line is NOT 10 gauge. Since the 12 volt for your year Model Norcold is just for operating the refer electronic controls, odds are the supply gauge is 16/14 gauge. But, it will NOT be larger than 14 gauge. Doug

Seems like the wrong approach to me. Send him to the store and buy an cheap digital voltmeter. Measure the voltage at the refer with the comperssor running, no shore power and battery partially discharged. If it meets mfg specs then wiring is OK. Next repeat but measure at the battery terminals to make sure batteries are OK. Better yet have the batteries load tested. What did he find?

Otherwise measure the distance for new wires and use a wiring calculator to find the wire ga needed for the new wires. And go directly from the refer to the battery with a fuse unless there is some really heavy wire nearby that can be used.

wa8yxm wrote:
For smaller an adjustable wrench (The one that made crescent famous)

I always thought the rolls made crescent famous.

I checked my wiring diagrams for my rig. They use a different coding.
Factory refer is more likely around 16 gauge.

OP here, to make a short story long...

Dad's coach is a 07 or 08 Fleetwood Bounder Diesel.

He recently had the 12v JC Refrigeration compressor unit installed and has had several problems with it. I've been helping him troubleshoot the problems.

The latest problem could possibly be a result of excessive voltage drop in the 12v supply to the JC unit. The JC unit is supplied with a connector that plugs directly into the 12v supply wires to the original Norcold unit after the Norcold is unplugged. They also state that the 12v supply wires should be minimum 10 gage. I have doubts that the original factory wiring to the Norcold was 10 gage, thus the question about the markings.

As said..always go bigger on any manufacturer’s wire size you are replacing.