greg_g
Super Member
- Joined
- Dec 18, 2003
- Messages
- 6,086
- Location
- Western Kentucky
- Tractor
- JD3720 Cab, 300X loader with 4-in-1 bucket
Re: No \"glow\" Glow Plugs
</font><font color="blue" class="small">( What you've described is just plain -Parallel- electrical conection... I know it is a tad nit picky.. but for the electrical novices that have just taken basic ac and dc electronics.. the use of series and parallel in the above fashion may confuse some)</font>
You're not considering the whole circuit Chris. When ganged by bussbar (jumper wire on two cylinder models), the glow plugs represent a parallel segment in a series-parallel circuit. It's dead simple to draw out yourself. At the risk of being redundant, it goes
SUPPLY
battery (+12v)
cable
starter solenoid
wire #2
system fuse
wire #3
ammeter
wire #5
ignition switch
wire #12
All in series so far, agreed? None of the paralleled glow plugs will operate if there is an open anywhere in the supply segment of the circuit. Series. So let's take it from wire 12 again, still in series:
wire #12 (series)
bussbar or jumper wire #13 (parallel)
glow plugs (parallel)
cylinder head (parallel)
GROUND
negative cable (series)
battery (-12V)
A 30A system fuse will blow long before a bussbar/jumper could possibly melt, so any open in the paralleled segment will not interrupt the circuit to the other glow plug(s). But an open in either series segment, kills the entire circuit. Series-parallel.
I keep saying, that one of these days you're actually gonna have to BUY a Chinese tractor. Once you've invested some troubleshooting and maintenance hours on these things, the dinosaur technology will start making more sense to you.
//greg//
</font><font color="blue" class="small">( What you've described is just plain -Parallel- electrical conection... I know it is a tad nit picky.. but for the electrical novices that have just taken basic ac and dc electronics.. the use of series and parallel in the above fashion may confuse some)</font>
You're not considering the whole circuit Chris. When ganged by bussbar (jumper wire on two cylinder models), the glow plugs represent a parallel segment in a series-parallel circuit. It's dead simple to draw out yourself. At the risk of being redundant, it goes
SUPPLY
battery (+12v)
cable
starter solenoid
wire #2
system fuse
wire #3
ammeter
wire #5
ignition switch
wire #12
All in series so far, agreed? None of the paralleled glow plugs will operate if there is an open anywhere in the supply segment of the circuit. Series. So let's take it from wire 12 again, still in series:
wire #12 (series)
bussbar or jumper wire #13 (parallel)
glow plugs (parallel)
cylinder head (parallel)
GROUND
negative cable (series)
battery (-12V)
A 30A system fuse will blow long before a bussbar/jumper could possibly melt, so any open in the paralleled segment will not interrupt the circuit to the other glow plug(s). But an open in either series segment, kills the entire circuit. Series-parallel.
I keep saying, that one of these days you're actually gonna have to BUY a Chinese tractor. Once you've invested some troubleshooting and maintenance hours on these things, the dinosaur technology will start making more sense to you.
//greg//