1998 Bobcat 753 Glow Plug Issue

[streetrider13]

I'm having issues getting my glow plugs to work. I've tried searching all over the web and came up empty. Even the bobcat manual offers little help. I can't get a voltage reading at the power bar. All of the plugs ohmed at about 2 ohms each. I tried unplugging the relay and plugging into another relay but still no luck. To get a voltage reading i've been putting one lead on the cable that connects to the glow plug bar and the other lead to a engine ground (starter bolt). If someone could shine some light on what to look for next I would really appreciate it. Thanks

 

[OldMachinist]

What's the first 7 digits of the serial number so I can look at the wiring diagram.

 

[antfarmer2]

What's the first 7 digits of the serial number so I can look at the wiring diagram.

On my 743 there is two plugs on the left side of the seat that fail alot might have to lift the cage to find

 

[walio123]

First check all fuses. If they are ok check relay.Relay has 4 ports. 1 command that receive commands from the ignition key, or the button,1 graunded and 2 workining. Remove the relay, and look where it enters the base.Looking base hole closest to the clip of the relay is the cable which comes voltage to the spark plugs. Check connections betwin port hole and glow plug bar .If no connection replase cable. Next hole clockwise grounded.Check the connection between this port and the negative battery cable or engine base.If no connection replase cable. Next hole port clockwise is positive constant, between it and the cable that goes to the relay plug makes the connection, when given command / ignition switch or button /.Measure the voltage. If no voltage reading-replase cable.Next hole clockwise is comannd port.To check it, you will need another person. With a cold engine give contact and / or press the heating. Voltmeter should show you 12-14 volts. If not, you need to check the connection between this port and heater switch or ignition key.Ako everything described here is ok , you have to change the relay. Sorry for тхе bad Еnglish language, I hope that was useful to help.

 

[streetrider13]

First check all fuses. If they are ok check relay.Relay has 4 ports. 1 command that receive commands from the ignition key, or the button,1 graunded and 2 workining. Remove the relay, and look where it enters the base.Looking base hole closest to the clip of the relay is the cable which comes voltage to the spark plugs. Check connections betwin port hole and glow plug bar .If no connection replase cable. Next hole clockwise grounded.Check the connection between this port and the negative battery cable or engine base.If no connection replase cable. Next hole port clockwise is positive constant, between it and the cable that goes to the relay plug makes the connection, when given command / ignition switch or button /.Measure the voltage. If no voltage reading-replase cable.Next hole clockwise is comannd port.To check it, you will need another person. With a cold engine give contact and / or press the heating. Voltmeter should show you 12-14 volts. If not, you need to check the connection between this port and heater switch or ignition key.Ako everything described here is ok , you have to change the relay. Sorry for тхе bad Еnglish language, I hope that was useful to help.

Thanks for the quick responses. Tonight after work I will get the serial number and trouble shoot the wiring. I'll write back with what I find.

 

[streetrider13]

Thanks for the quick responses. Tonight after work I will get the serial number and trouble shoot the wiring. I'll write back with what I find.

Found the problem!! The connector to the glow plug switch somehow completely corroded. After wiring in a new toggle switch with light she works great now. Thanks again for all the help!