samhaley
Member
Hey y'all I recently purchased an 09 cat 277c but it has some starting problems. I insert the key and switch it to the on position wait until the unit beeps and then try to turn it over but nothing. It does crank but doesn't actually run. I tried spraying a bit of starting fluid on the air filter and voila it started right up but smokes a bit from the exhaust. Since I am no diesel mechanic I read a bit online and suspected the glow plugs. I placed my multimeter on the metal bar that connects all 4 and ground, turned the key and there is no voltage. I followed the wire and it connects to a relay within the engine bay. I removed it and there is 12 volts across the solenoid terminals and I do get a signal when the key is switched a cross the switch terminals. You would think it was the relay but I tested the relay not only does it "click" but I fully tested it with a power supply and it seems operational when power is applied at the switching terminals the relay closes/opens accordingly so I plugged it back in and moved on to the operator cabin where the fuse box is located and found another glow plug relay and fuse. I swapped the relay with a known good one and the fuse was good but theres still no power at the plugs.. I am hardly familiar with the machine and don't have anything more than the manual. Is there something I could be overlooking?