Oliver 1650 electrical issue

Russ Cook

New User
I have an Oliver 1650 gas and I am having a hard time troubleshooting an electrical problem. I first thought it was a solenoid issue but now I am not so sure since I purchased a new solenoid and the problem persists. Basically when I turn the ignition switch, I get nothing. On my solenoid there are 4 posts. There is the main battery terminal with the battery lead and a red wire that goes to the amp gauge. Next is a smaller terminal that has a pink wire that goes to the center starter post on the key switch. There is another smaller post that has a white wire that goes to the coil and it also has a black resistance wire that goes to the IGN terminal on the key switch. Finally the forth terminal connects straight to the start post. I found that if I take a extra wire and connect it to the solenoid post that goes to the coil and ground it to the tractor frame then the engine will crank over when I turn the key but it appears I get no spark. I assume this is because I am grounding it so the coil is no longer getting juice. I do not know if I have a short somewhere or I am missing a ground someplace. Any ideas to help trouble shoot this would be greatly appreciated.
 
You have the wrong solenoid. There are two types of 4 post solenoid. Large posts wire the same on both so the difference is in the small terminals.

1. S post (start) connects internally to activating coil and other end of activating coil is grounded internally to the case so when you apply start voltage the solenoid is activated. The wire from I (ignition) post going to the switch has resistance built in to reduce voltage on your 6 volt coil. When solenoid is activated the internal plunger applies full 12 volts to the I terminal increasing voltage to the coil for a hotter starting spark. You are wired correctly for this solenoid.

2. The activating coil is connected internally between S and I posts with no case grounding connection. One post is connected the voltage source, other post is connected to ground with start switch on one or other side.

Sounds like this is the solenoid you have.

On this one you should have continuity between S and I terminal, with both terminals open to ground.

On the correct solenoid you should have continuity between S terminal and case, no continuity between S and I terminal.

Get the correct solenoid and it should work.
 
Russ, I had that same problem with my 77, after changing the solenoid and getting no juice. I changed the main ground cable, end of problem. the ground cable looked fine from the outside but was corroded on the inside. Chuck
 
Russ, I had that same problem with my 77, after changing the solenoid and getting no juice. I changed the main ground cable, end of problem. the ground cable looked fine from the outside but was corroded on the inside. you can test this first by running a jumper cable from the ground side of the battery to the engine block and see if you have power. Chuck
 
Wow, I am having the same problem, only I have a diesel. I am getting 10+ volts when testing between ground and the starter. There are two six volt batteries on this tractor and when I tested them I was getting over six volts on each battery. I see on the wiring diagram there is supposed to be a safety switch, but I haven't found that yet.
 
The safety switch is under the transmission shifter cover. If you look at cover from the right side of the tractor you should see 2 wires with plug in terminals that will connect to 2 wires coming out of the wiring harness. In neutral you should have continuity.
 

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