This is something I found from googling. It is in reference to a 1998 Four Winns Horizon, not sure if it would apply to the Sundowner as well.
So you hit the ignition switch so you can go home and either nothing happens, or you here a click from the engine, but the starter doesn't crank......... Now what ??? If you have a test light, you can find out in only a few minutes what the problem is. I like test lights because they are faster and easier to use than a meter. A meter will work fine for all the tests.
We will start by assuming you have a good battery, clean tight connections with good battery cables of the proper size. So, where do you start looking for your no start condition? That depends on what you hear. If you DO NOT hear a click, we will start at the ignition switch, if you hear a click, we will head for the engine compartment. Let's say we have no click, and the shifter is in the neutral position and we have already tried wiggling the lever to be sure it's in neutral. Grab your test light and head for the back of the instrument panel. Hook the clip to a good ground (usually on the fuse panel). Now, touch the light to the B terminal on the ignition switch ( big red or red/purple wire) the test light should light. Now move the test light to the S terminal with the yellow/red wire and have someone turn the key to the start position. The test light should light, if not, you need a new ignition switch. Let's say it lit up, so the switch is good. While the problem could be the neutral safety switch, it's a real pain to get to in order to test it. So let's check to see if we have power going through the neutral safety switch.
Time to head for the engine compartment. Now, locate the slave solenoid on the engine. Notice the 4 wires to it?
Hook up your test light again with the clip on a good ground. Now touch terminal C of the slave solenoid with your test light and have your helper turn the key to the start position again. The light should light up? If it did, touch your test light on terminal A, if it lights, hook your test light lead to it, and put the probe on terminal D (the ground) if it doesn't light, then you have a bad ground for the slave solenoid and without that ground the slave solenoid will not work. If the test light did not light up, then the problem is 1 of 3 things either the connection at the main engine harness plug is bad, or you have a bad neutral safety switch or a bad connection between the ignition switch and the slave solenoid. If you are at home, this isn't a problem and you can track the problem down. But if you are out on the water what can you do???? Simple. Use a test lead on the slave solenoid to jump between terminals A and B or A and C and the engine will crank. Make sure the ignition switch is in the run position and the engine will start.
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