Soundguy
Old Timer
- Joined
- Mar 11, 2002
- Messages
- 52,238
- Location
- Central florida
- Tractor
- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
I just connected my multimeter to the positive battery terminal and positive connection on the glow plug and my meter read -13.49V (see picture at address below).
http://img.photobucket.com/albums/v347/kawiracer/Tractorvoltagereading_zpsce2ff547.jpg
When I place my negative lead on the negative terminal of the battery and the positive terminal on the positive connection for the glow plug, I get no voltage until I turn the key to the "heat glow plugs" position, and then I get a reading of only 10.96 to 11 volts. Perhapps that isn't enough to warm the plugs? Would that make more sense? I know that the engine is a little tired (about 1100 hours), but I'm hoping I'm not fighting an engine with low compression.
Thanks everyone!
it's exactly what I expect to see. that glow plug is a very low ohm, high current laod.
if you say battery volts there with key on.. i'd say the plug was OPEN.. but that voltage drop is entirely normal.. resistors have a voltage drop across them.. that glow plug is a resistor. ( heating element ).