Ford 1720 Ignition switch

[D Roc]

i am trying to locate a website or somewhere that i can order a replacement ignition switch for my 1720. local tractor parts store wants 124.21 for swith with wiring harness and 123.21 with out wireing harnes....YES i know makes no sense at all.

I have found tons of switched on the net for 34-42 but they dont list that it is compatiable with my model.

is there a standard switch that will go on all Ford diesel tractors?

 

[mitch becton]

your local napa store should be able to supply this all you need to know is how many spades are plugged into it most have any where from three to five spades should be less than $30.00 and no wiring harness needed.

mitch becton

 

[D Roc]

your local napa store should be able to supply this all you need to know is how many spades are plugged into it most have any where from three to five spades should be less than $30.00 and no wiring harness needed.

mitch becton

Thanks for the info. I will stop at napa this weekend.

 

[AlbionWood]

I need one for a 1920, NH quoted price of $147.90 - !!! Napa has a five-terminal four-position (Accessory, Off, Run, Start) that sounds like a match, for $23. I'm headed there tomorrow.

 

[Soundguy]

they like them key switches don't they!

soundguy

 

[RickB]

I need one for a 1920, NH quoted price of $147.90 - !!! Napa has a five-terminal four-position (Accessory, Off, Run, Start) that sounds like a match, for $23. I'm headed there tomorrow.

It's highly doubtful the NAPA switch has the amperage rating required to reliably carry the glowplug current over the long term. But it will only cost $23 to find out.

 

[Kernopelli]

You can purchase aftermarket Ford tractor 4 position switches w/2 keys for about $20 including shipping on ebay from a number of sellers. The "accessory" position is supposedly designed for glow plug use. I purchased one and ended up giving it to a coworker for his tractor about two yrs ago and it's worked fine.

 

[Soundguy]

going with what rick said, I'd offload that glow plug current to a 10$ generic 3 or 4 terminal 'hot' on starter relay.

take 1 extra piece of wire and would for sure carry the amps..

soundguy

 

[AlbionWood]

Local Napa did NOT have a 5-terminal, 4-position switch. Best they could do was a 4-terminal 4-position.

There are 2 wires for the glow plugs - both black with white stripe - and both terminals connect to a single position in the switch. These go hot when the switch is turned back for "glow," and also when the switch is turned forward for "Start." I suspect RickB is right again, if I connected both wires to the Acc position on a regular Napa switch it would burn it up sooner or later.

I live in a mild climate, and have never needed the glow plug warmup option. Soundguy, do I understand correctly, you could offload both glow plug wires to a normally-open relay, and run the starter wire to that relay in order to close it?

In any case, I'm ordering an aftermarket switch. $14.50 from TractorPartsInc.com... How does NH justify 10X that price???

 

[Soundguy]

the connection on the switch that would normally power the glow, instead powers the field on the NO relay.. the relay has one side of it's load connected to the glow ckt, and the other side to bat. one side of the relay field is grounded, the other side is activated by the key switch in the 'glow' or whatever position(s) you assigned it to..

soundguy

 

[mostly_gas]

The short answer is the two switches really are not the same part. As noted above the NH is more robust to carry the glow plug electrical load. Also the NH switch is likely in "service" production, which means run quantities are much lower raising the cost to produce. Cost to produce a service part in automotive industry is 2X-5X to produce same part in service mode as opposed to when car was being assembled.

 

[AlbionWood]

The short answer is the two switches really are not the same part.

Too right! It arrived today and has different terminals... the OEM switch has screw-ons (ring terminals on the wires), the replacement has spades.

 

[chopped]

That sure stinks.I wonder if they make a ring to spade connectors I looked on radio sahck and couldnt find any.
One ide would be to use the spade and a ring and a short piece of wire between them. Or possibly connect them directly together and solder.
Either way It would be nice not to have to cut the wire..
Let us know what you choose.Oh, didnt they state the type of terminals in the description

 

[AlbionWood]

That sure stinks.I wonder if they make a ring to spade connectors I looked on radio sahck and couldnt find any.
One ide would be to use the spade and a ring and a short piece of wire between them. Or possibly connect them directly together and solder.
Either way It would be nice not to have to cut the wire..
Let us know what you choose.Oh, didnt they state the type of terminals in the description

Nope, no description of the terminals in the online catalog. Caveat Emptor, I guess.

Agree, don't want to cut those wires! Fortunately it turns out the switch is OK after all (see thread about Electrical probs). If I did have to use this one, I might try drilling out holes in the blades and get backing nuts for the little screws, before trying to fabricate some adapters.

 

[chris0152]

Is there a tractor supply near you? I found a ford 5 position switch on the shelf there for $24

 

[Soundguy]

I think I'd just but a ring and spade togehter and hit it with a lil solder before going to the trouble to drill out a terminal and then add a nut.

it's just a switch...

soundguy

 

[dannyojudd]

Kubota 66706-55120 is exact replacement. Purchased from Messicks about $35.00. Hope this helps someone. Used on 1988 1720 2WD. Wiring harness has two connectors that enables one to take the ignition switch to the bench to switch the wires.