1991 Cobra Salem Travel Trailer Manual

Getting Your Hands on a 1991 Cobra Salem Travel Trailer Manual

Finding the right documentation for a travel trailer from 1991 is something of a hunt. Cobra was a smaller manufacturer, and they folded into other companies during the early 2000s. Salem is actually the brand name under Forest River now, but back then Cobra produced these trailers under their own name before the acquisitions happened. You won't find an official current manual on anyone's website, so you're working with what survived in PDF form or on forums. The most reliable sources are trailer owner forums and archive sites. RVingForBeginners has some scans, and the Cobra Salem owners group on Facebook occasionally shares copies. You can also try scraping through the Internet Archive's Wayback Machine, though pages from that era are spotty at best. Some people have digitized copies sitting in their Google Drive folders and share them on Reddit's r/RVmanuals or r/trailers. If you're willing to spend a few dollars, eBay sometimes has scanned copies for sale from people who inherited originals. I spent maybe six months tracking down a decent copy for my '91 Salem. What I ended up with was a scan of the original owner's packet that someone had photographed with their phone and uploaded. It wasn't perfect, but it covered the basics: floor plan, wiring diagram, plumbing layout, and the limited warranty info from the time. The most useful section was the wiring diagram, which is where most people hit problems once the trailer gets older.

Here's what I found the manual typically covers: tire pressure specs (usually around 65 PSI for the duals), ProPact or similar surge brake adjustments, the 30-amp electrical system breakdown, water pump operation, and the LP gas system layout. Nothing groundbreaking, but when a component fails and you're trying to trace it back, having the original routing matters more than you'd think. The electrical section in particular is worth studying before you do anything. These trailers used a standard 30-amp setup with a main breaker panel inside near the entrance door. The lighting circuit runs through a bus bar, and if you're troubleshooting a dead light or outlet, the diagram shows you exactly where to check. Without it, you're pulling panels apart hoping to find the right wire.

What to Expect From a 1991 Cobra Salem

These trailers were built solid for the time. The frames were galvanized steel, the sidewalls used aluminum over a wood frame, and the roofs were made of the rubber-type material that's prone to seam issues after thirty-plus years. Inside, you'd find laminate countertops, a refrigerator that ran on either 12-volt DC or 120-volt AC, and an appliance package typical of early '90s production — Dometic or Atwood for most everything. The floor plans varied depending on the model. You had options ranging from small two-room layouts to the longer models with a front bedroom and a rear bathroom. The bathroom in most of these had a composting-style or standard flush toilet, a combination shower/tub, and a small vanity. The kitchen included a three-burner stove, a sink with both hot and cold water, and enough cabinet space that it actually worked for extended trips. One thing the manual doesn't always make clear is that the water heater could be plumbed for both Propane and electric. If yours only has one heating source, that's probably because a previous owner removed the other. The original setup used a standard 6-gallon tank with an anode rod that needs replacing every few years. If you're not getting hot water and the propane is fine, check the anode first. That's the easiest thing to overlook.

Common Issues and Workarounds

The biggest problem I ran into was with the brake controller wiring. The factory harness had deteriorated to the point where the brakes would engage intermittently, which is a really unpleasant experience on a downgrade. The manual showed the color codes for the wires, but the insulation had cracked enough that the colors were unreliable. What I did was trace each wire back to the connector, tag them with electrical tape, and then run new wiring through a protective loom. It took about two hours and cost me roughly forty dollars in parts. Better than finding out the hard way. Another issue specific to these older trailers is the roof sealant around the air conditioner and vent hoods. The original butyl tape degrades over time, and by 1991 equipment, you're looking at significant exposure. Water intrusion in the ceiling area can look like a small stain and turn into a structural problem if you ignore it. I found this out the hard way after a heavy rain season — there was soft wood behind the ceiling tile near the AC unit. Replacing that section of plywood and re-sealing the mount cost me a few hundred dollars and a weekend I'd planned for something else. The LP system is another area where the manual is only partially helpful. The gas lines are copper, which is good, but the fittings use flare connections that can loosen over time from vibration. I've seen at least two cases where the connection at the propane tank valve worked loose enough to cause a leak. Use soapy water on every fitting you find and check annually. A quick sniff test isn't as reliable as you'd hope.

Electrical System Notes

The 1991 Salem used a 12-volt DC system for interior lighting, water pump, and fan operation, fed from a deep-cycle battery. The 120-volt AC side powered the refrigerator, any installed air conditioning, and standard household outlets. The conversion between the two happens at the converter/charger unit, which is usually mounted near the main breaker panel. These units from that era are notorious for failing capacitors, and when they do, you lose both the charging function and the DC output. If your lights are flickering or the battery won't hold a charge while plugged in, check the converter first. It's a cheaper fix than replacing the battery. The manual lists the amperage rating, which varies by model but is typically around 35 to 50 amps. Making sure the input and output connections are tight matters more than most people realize — loose terminals here cause intermittent problems that are nearly impossible to diagnose without a diagram. The fuse panel is located behind a small access door near the entry, and it uses standard automotive fuses. If something stops working suddenly, check the fuse before you assume the component is dead. I replaced a water pump that turned out to have a blown 3-amp fuse. The manual lists every fuse and what it protects, which saves time you'd otherwise waste troubleshooting.

Maintenance Schedule From the Manual

The recommended maintenance intervals are straightforward but easy to skip. Annual items include checking tire condition and pressure, inspecting the brake system, testing the smoke and CO detectors, and greasing the wheel bearings. Every three years, replace the water heater anode rod and inspect the roof seals. Every five years, replace the breakaway battery if you have a surge brake system. The manual also recommends flushing the water system twice a year — once before winterizing and once when you reopen for the season. Use a standard RV system cleaner, let it sit for the recommended time, then flush thoroughly with fresh water. Skipping this leads to mineral buildup that reduces flow and can damage the water pump over time. One thing worth noting is that the tire dates matter more on a trailer than on a car. These trailers sit stationary for long stretches, and the weight is concentrated on fewer contact patches. Even if the tread looks fine, tires older than six years should be replaced regardless. The manual doesn't emphasize this nearly enough, probably because the thinking at the time was different about tire longevity.

If you end up getting ahold of the 1991 Cobra Salem Travel Trailer Manual, keep it somewhere dry and label it clearly. You might not look at it often, but when something goes wrong at 2 AM in a campground with bad cell service, having the diagrams in your hands instead of guessing is the difference between fixing it yourself and waiting until morning for help.