TC33 won t start -- sometimes: New Holland Tractors  -- Popular Compact Tractors Discussion Forum and Review TC33 won t start -- sometimes: New Holland Tractors -- Popular Compact Tractors Discussion Forum

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 01-20-2018, 22:11 Post: 197431
nhuser



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 TC33 won t start -- sometimes

Well it looks like I'm several years late to this thread but I'm having the same problem. Turn ignition switch to start, starter solenoid just clicks, won't turn engine. Try two or three times more finally will start. New battery, cleaned cable connectors, rebuilt starter (works fine at the repair shop). When Voltage on control wire that pulls in solenoid is 7volts or above, solenoid fully engages and starts tractor. When solenoid just clicks and doesn't turn starter, the voltage on control wire is 5 volts. Checked every cotton pickin safety interlock switch on there plus all relays. Still Can't see why control voltage is sometimes too low on solenoid. If ignition switch is held in more that about three seconds in start position and starter doesn't turn then a 7.5 A fuse is blown. If starter is turning but engine not yet running it doesn't blow the 7.5 A fuse. Somewhere I'm loosing enough voltage to fully engage the solenoid but can't find it in this complicated mess before the 7.5 A fuse blows. Anyone come up with an answer? Sure would appreciate any help. I can bypass all the safety switches, etc putting 12 volts directly on the solenoid control terminal and it works but don't like by passing the safety switches. Thanks!






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 01-22-2018, 10:43 Post: 197434
nhuser



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 TC33 won t start -- sometimes

JL, thanks so much for your response. I didn't think anyone from the original thread years ago would still be signed up.Surprise, surprise
.
Well I don't feel so bad now that you have told me your technical background. I have a BS degree in Electronics and worked for 32 years as an electronics tech at the local Michelin Tire Plant. We had our own electronics repair shop at the plant which I ran for many years....so....I felt really dumb not being able to trace down the problem with my TC33D start problem. Probably like you, I tore that electrical interlock system down and still couldn't find the problem before blowing the 7.5 amp fuse.

I really like the tractor but as you said the the safety system sucks. I believe there is a design flaw but I'm sure New Holland won't own up to it.
I've had to replace the ignition switch also. I got a heavy duty one from my local Tractor Supply and it is working fine.

There is a black box module in that circuit that I "think" may be causing the problem. It's not shown on my schematic and there's no telling what it would cost to replace.
I think I'll try bypassing the module and keep all the safety switches in the active circuit and see what happens. I want to keep at least some of the safety switches active as you did.

I also got tired of replacing the expensive glow plug timer and by-passed it with a push button mounted on the dash. I just hold it in for about 3 or 4 seconds (the glow plug light comes on during this time) and then start. It works but it is too bad that you have to by-pass anything.

I'll be experimenting with the start problem when the weather warms a little. I made my own weather canopy over the seat area bolted to the ROPS so I can't remove it easily, otherwise I would park it in the garage to work on.

I'll post when I come up with something and thanks again for your response.
Dwane






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 01-26-2018, 12:03 Post: 197440
nhuser



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 TC33 won t start -- sometimes

Thanks Hogslayer for your reply. That actually makes perfect sense. I should have thought of it myself, but, oh well, that's what happens when you get old I guess. I'm thinking about using a standard fully enclosed 12v auto relay as found at O'Rielly's. I've used them to control some high intensity 12 volt DC LED spot and flood lights mounted on my truck. I'm wondering if the 5 volts I sometimes get on the control wire to the solenoid is enough to activate the 12 volt relay. I'll have to experiment and see. If it does, great, if it doesn't then I may have to look for a 6 volt relay. But I'll get it working one way or another. Thanks so much for your help. Actually the heavy coil in the solenoid probably pulls the voltage down even further after going through all those interlocks, so without that load on the circuit the 12 volt relay should be sufficient. I'll find out.






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 03-12-2018, 12:47 Post: 197577
nhuser



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 TC33 won t start -- sometimes

I added a 12DC 40A relay to the start circuit of my NH TC33D to overcome the start problem caused by low voltage to the start solenoid. Resistance in the safety switches resulted in the low voltage on wire HM17 V-1.0





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 03-12-2018, 11:53 Post: 197578
nhuser



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 TC33 won t start -- sometimes

Thanks for all the help to get this issue resolved. Much appreciated. The diagram I posted shows how I finally wired in the 12DC 40A automotive relay. All the safety switches are still in the circuit, didn't want to by-pass any. The relay supplies a good +12VDC to the solenoid. Now instead of clicking several times to start the tractor it starts up first time everytime. I also added an in line fuse holder with a 5 amp fuse from the +12VDC terminal shown in the diagram to the normally open contacts on the relay for safety.






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