I'm still pretty new to working on my RV and could really use some guidance. My 2001 Chieftain on an F53 chassis just lost both turn signals and the 4-way hazards at the same time. I checked the fuses and they seem okay, but I'm not sure where to look next.
Since both systems failed together, I'm wondering if there's a common cause I should be looking for? I know there are separate relays for left and right turn signals, but it seems weird that both would go bad simultaneously. Could this be related to the emergency flasher relay or maybe a wiring problem somewhere?
Any advice on where to focus my troubleshooting would be really appreciated - I don't want to just start randomly replacing parts!
Your 2001 Chieftain's simultaneous loss of both turn signals and 4-ways points to a common power supply issue or the emergency flasher relay, not the individual turn signal relays. The most likely culprits are the emergency flasher relay or a wiring issue in the common feed circuit.
First, check all related fuses in the fuse box - turn signal, hazard, and ignition fuses. If your fuses are good, the next likely issue is in the common power feed that supplies both the turn signal and hazard circuits. On Ford F53 chassis, this typically comes from the ignition switch through a splice connector. These splice connectors can corrode or develop high resistance over time, especially on coaches that are 20+ years old with higher mileage.
Check for power at the emergency flasher relay socket with your test light - specifically at the power input terminal (usually terminal 30 or marked B+). Use caution to avoid creating shorts between terminals. If you're not getting power there, trace back toward the ignition switch.
Safety First: Disconnect the negative battery cable before working on electrical components to prevent shorts and injury.
Follow these steps:
1. Check for power at both relay sockets with your test light (you should see 12V at the power input terminals)
2. Locate and test the emergency flasher relay - this is your most likely culprit
3. Test the turn signal switch and hazard switch - verify they're sending signals to the relays
4. If power is good, swap both the emergency flasher relay and turn signal relay with known good ones
5. If no power at the relay, trace back through the fuse box connections and ignition switch feed
Given that everything failed simultaneously, common causes include either the emergency flasher relay, turn signal relay, or a power supply issue to those relays. The interconnected nature of these circuits on Ford F53 chassis makes this type of total failure more common than you'd expect.
Start with the emergency flasher relay - it's the cheapest and easiest fix to try first. If that doesn't solve it, then you'll need to dig deeper into the wiring, but that relay failure pattern fits your symptoms perfectly.
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