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Old 09-20-2018, 08:48 PM
derfsaint derfsaint is offline
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Nav Anchor lights throw fuse 2007 X2

I just bought a new (to me) 2007 X2. When I turn on the nav lights or the anchor lights, the fuse is immediately tripped. I took the boat to a Mastercraft dealership to have a bunch of other things done to it. They said the nav lights were corroded and needed to be replaced. I told them I would replace them myself. I did, and the fuse is still tripped when turning on the anchor or the nav lights. I disconnected the wires going to the tower, and the fuse still trips. Any idea what to try next?
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Old 09-20-2018, 08:54 PM
MLA MLA is offline
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Id look close at the 360 anchor light circuit, since its the only light that on on both positions. Pinched or rubbed through the tower sounds logical.
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Old 09-20-2018, 09:09 PM
derfsaint derfsaint is offline
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That's a good point, MLA. I disconnected the wires going to the 360 anchor light at the quick disconnect on the tower. Are you thinking it may be shorting out somewhere between the switch and the the tower disconnect? Could/should I disconnect each wire one at a time from the switch, and see if the fuse stops throwing?
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Old 09-20-2018, 09:31 PM
MLA MLA is offline
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I disconnected the wires going to the 360 anchor light at the quick disconnect on the tower.
If the fuse doesnt blow, you isolated it to the 360 and to the section between the connector and lamp. If it still blows, still could be the 360 but between the switch and connector.
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Old 09-21-2018, 08:28 AM
derfsaint derfsaint is offline
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Got it, thank you.
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Old 09-21-2018, 08:46 AM
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JimN JimN is offline
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Originally Posted by derfsaint View Post
I just bought a new (to me) 2007 X2. When I turn on the nav lights or the anchor lights, the fuse is immediately tripped. I took the boat to a Mastercraft dealership to have a bunch of other things done to it. They said the nav lights were corroded and needed to be replaced. I told them I would replace them myself. I did, and the fuse is still tripped when turning on the anchor or the nav lights. I disconnected the wires going to the tower, and the fuse still trips. Any idea what to try next?
How did you make the new connections? If you twisted and taped the wires, go back and use Heat N Seal butt splices.

If you pulled on the wires coming up from below the gunwale, go under and look for chafing. If it's chafed, repair the wires and use some kind of protective wire loom.

If you know someone who does custom installation of AV equipment, ask if they have a TDR (Time Domain Reflectometer)- connect it to the wires at the switch and it will show the distance to the short.
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Old 09-22-2018, 08:45 AM
derfsaint derfsaint is offline
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Thank you JimN. Never knew TDRs existed.
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Old 09-22-2018, 10:27 AM
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Thank you JimN. Never knew TDRs existed.
We use them because it's often impossible to see the cabling and it saves a lot of time. I borrowed one when a camera went out at a bar/restaurant and when I pulled the cables out, it was clear that some kind of critter had chewed them.
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Old 09-26-2018, 04:50 PM
derfsaint derfsaint is offline
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Welp, here is an update:

I crawled under the dash and removed all the wires from the switch.

On the "left" side of the switch there are three prongs. A daisy chained grey/black wire connects to the "top" and "bottom" prongs. An orange wire connects to the middle prong. All other wires are disconnected. If I connect the orange wire, connect the top grey/black wire, throw the switch up nothing happens, throw it down and the fuse blows. If I disconnect the top grey/black wire and connect the bottom grey/black wire, and move the switch up, nothing happens. When I move the switch down, the fuse blows.

On the "right" side of the switch. Basically the same thing happens. Connect the orange wire and the one grey/black wire (daisy chained from the other side) and move the switch nothing happens one way, the other way, the fuse blows.

(There is also a black wire which connects to the top-center prong, and a bundle of blue/light blue/black wire that connects to the bottom right-side...)

Am I right in thinking the right side of the switch is for the NAV lights and the left side of the switch is for the ANC light? Like MLA pointed out below, the anchor light is suspect because the fuse blows on both sides of the switch. Or, is it the switch? Breaker? Or something else? Can I bypass the switch and connect wires together to see which combo is blowing the fuse?

Thanks again for your input.
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Old 09-26-2018, 05:40 PM
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Originally Posted by derfsaint View Post
Welp, here is an update:

I crawled under the dash and removed all the wires from the switch.

On the "left" side of the switch there are three prongs. A daisy chained grey/black wire connects to the "top" and "bottom" prongs. An orange wire connects to the middle prong. All other wires are disconnected. If I connect the orange wire, connect the top grey/black wire, throw the switch up nothing happens, throw it down and the fuse blows. If I disconnect the top grey/black wire and connect the bottom grey/black wire, and move the switch up, nothing happens. When I move the switch down, the fuse blows.

On the "right" side of the switch. Basically the same thing happens. Connect the orange wire and the one grey/black wire (daisy chained from the other side) and move the switch nothing happens one way, the other way, the fuse blows.

(There is also a black wire which connects to the top-center prong, and a bundle of blue/light blue/black wire that connects to the bottom right-side...)

Am I right in thinking the right side of the switch is for the NAV lights and the left side of the switch is for the ANC light? Like MLA pointed out below, the anchor light is suspect because the fuse blows on both sides of the switch. Or, is it the switch? Breaker? Or something else? Can I bypass the switch and connect wires together to see which combo is blowing the fuse?

Thanks again for your input.
First, you need to know which wires do what, then, you need to know how the switch works, e.g., which tabs are input & which are output. These switches usually have the input going to the middle tab and both of the others are output, depending on their position. If the switch has two set of three, one is used for the nav light and the other is for the anchor light and neither should have a + AND a - connected to the switch, only the +.

Do you have two sets of wires, with two wires in each? If so, test each by connecting the wires to a battery with a fuse in the way of the light- could be the boat's battery, a battery from a cordless tool, whatever. It should illuminate without blowing a fuse. If they bow the fuse, find the problem. If you have a meter, find the connections of the switch, or better yet, look for any numbers printed on it and look online- they should have the pinout posted.

Can you post a photo of the tabs on the switch and the wires?
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2007 x2, anchor light, fuse, navigation light

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