3016 hst low voltage at glow plug bus bar

[Tom3016]

Hello all I'm Tom, first off I'd like to give thanks for all the great info I've learned from this site, my 3016 has been a awesome little tractor for my needs and haven't had a single problem untill it wouldn't start right after I just started it and let it warm up some on a fairly chilly day, than shut it down to install a new battery, I reviewed all the posts about glow plug issues, and cleaned connectors and put a loop connector at the bus bar but just before reconnecting it I checked voltage during the initial glow plug warm up period and it only showed 8 volts? reconnected it and it would not start it. so I did a direct jumper from battery to glow plug for approx 10-12 seconds and it popped right off.. so I have a couple of questions, what controls the voltage to the bus bar? and what should I see for voltage with the little fuel pump clicking away?

Super thanks in advance, it's getting colder up here in MN.

Tom in Blaine MN

 

[Roadworthy]

I don't know what controls anything on a Mahindra. I do know that most NGK glow plugs are designed for 10.5 volts. 8 sounds a bit low.

 

[AchingBack]

It sounds as if your glow plug timer/relay has failed. Is the glow plug light on the dash coming on when you turn the key to activate it? This has been a common problem on the 15 series, not sure about the 16 series, but platforms are similar.

 

[Tom3016]

Good morning guys thank you so much for the quick response, yes the indicator light does come on and than goes out after several seconds, I did do some research on the NGK Q.G.S. controller 30H66-02300, Model R81NJ and came across some electrical wizard that had a few versions of this controller broke down, he didn't specify exactly which one. it seems there is a ramp up voltage, peak voltage, than a trailing voltage, that part was for reduced emmissions, but no specific numbers as it was on a graph, there are some other inputs with temperature but I couldn't understand where the input was coming from. I'd hate to pay for a new part than not have it work. Anybody know where the best place is to buy a new controller?

 

[lagolan]

I know this is going to sound like I'm insulting you, but: considering the problem occurred right after installing a new battery, I'd check the battery connections again.

Otherwise, here's what the service manual says about the glow controller:

 

[lagolan]

Also, take a look at the "Energize to run solenoid"

 

[Tom3016]

Thanks lagolan, no worries on the insult, that was the 1st place I went back to : ) never know when a guy can jack something like that up, I do not know what the "Energize to run" solenoid is, it cranked with the key but manually jumpered from + post to 1st glow plug at the bus bar and it started like nothing was ever wrong with it... Bye the way on my initial post I asked where the best place was to buy this controller? the answer is, any place you can find one

 

[Tom3016]

It came from Bills Tractor and Equipment out of Adkins Texas great service and the controller got here fast/ a day early

 

[Tom3016]

UPDATE when I removed the old controller I examined the 2 blades {bigger ones} in the socket that control the output voltage to the glow plug bus bar, 1 was clean and the other was almost black but not from over heating just some type of oxide, possibly the reason for my low voltage, I didn't have anything to clean it to test that idea so I installed the new one and cleaned it when I got home, the tractor started perfect with new controller installed. I want to thank everybody for their input.

Tom