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Old 01-27-2014, 04:38 PM
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quick question about plugging up block heater

i have a couple of 97 trucks. each one had its diff quirks when starting. my relay was bad on my first and i didnt figure it out for 5 years. it would always crank up after a couple tries. i thought the harness was bad on one side of the other. then i checked the solenoid one day and it was broke in half. i changed it and it was like a new truck.. when i would plug it up it would crank fine and the glow plugs would visually discharge the battery( after i changed the solenoid). now on this diff truck i have, the solenoid is working correctly. when its not plugged up but if i plug it up the glow plugs are not dischaging the battery and the solenoid doesnt seem to working. whats up with that?
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Old 01-28-2014, 09:21 AM
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TEST.

- How long does the WTS light stay on?
- Check voltage at both big terminals. Key off, one terminal should be hot (12.5-ish volts), the other should be zero.
- Turn key to RUN and check again. The voltage at the "hot" terminal (above) should be less, aprx. 11.5. You should now have voltage at the other big terminal. It might be less than the "hot" one (say, 11.3), but if the _difference_ is more than 0.3V, the relay is faulty.
- Turn the key off, put a voltmeter on the red/green wire small terminal on the relay, turn the key to RUN again. Does that terminal get voltage? It should.

- Glow plug check - measure the resistance of each glow plug at the UVCH connector. Should be right around 1 ohm each.
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Old 01-29-2014, 07:08 PM
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thanks for the info. i had checked all that before i had ever tried to plug it up at night when it was cold. i had also noticed that it was a little sluggish turning over and wouldnt even attempt to start. the batteries were less than 2 years old. i got to thinking that i had not cleaned the battery connections on this truck since i had bought it. i pulled the cables and they were blackened big time, i scrubbed them till i got them clean and put new bolts in them and it spun like a champ and fired up. it got down to 11 degrees and i tried to crank it without plugging it up. it wouldnt even think about it. i plugged it up and went to work. when i got home, i noticed that the voltage gauge didnt drop when i cycled the glow plugs. but it fired up and idled a little rough for 15 seconds. the next day it cranked right up unplugged and i noticed that the voltage gauge dropped like it was supposed to. the next day i plugged it up and the voltage gauge didnt drop. i thought plugging it up was related to my problem. like it was telling it it was warm enough to not light the plugs when i plugged it up.? well now the solenoid is dead! so i guess it was just going bad. i will change it and see what happens. i got this truck from an individual that was straight forward with me on everything. he showed me everything that was done to the truck for 13 years. when i test drove it it had a 100 hp kubota tractor behind it on a 24ft trailer. i did notice that the heater plug had never been used also. it doesnt seem to get the motor as warm as some of the other trucks i had.
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