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Old 09-14-2020, 02:51 PM   #1
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No power in trailer pigtail - 2006 Cayman

WE have no power to the plug. We are focusing on the module called monaco 3 in the second from rear bunk on the curbside of the unit.WE have looked at the diagrams u have so kindly provided but they dont match ours.

The relay is up in the front fuse box but seems to be working as do all the lights on the motorhome including signal lights, back ups, brake lights and hazards.

Fuses and relays in this box are for ABS, Ignition, exhaust brake, Power back up, Engine S and Engine M and something called Power TCM which we think is the transmission cooling module.There are three in line fuses either 30 or 60 amp in the compartment also which test out fine--All the fuses in the compartment test out fine.

We have tried to trace the wiring back from the plug but unable to see it.

Anyone out there have the wiring for the 2006 Monaco Caymen or have any more suggestions
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Old 09-14-2020, 03:50 PM   #2
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jloberg27-

According to the manual for your coach (link here), page 208, the Monaco #3 box is in the front of the coach. Per page 209, the trailer fuses are in that box.
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Old 09-14-2020, 03:56 PM   #3
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Quote:
Originally Posted by jloberg27 View Post
WE have no power to the plug. We are focusing on the module called monaco 3 in the second from rear bunk on the curbside of the unit.WE have looked at the diagrams u have so kindly provided but they dont match ours.

The relay is up in the front fuse box but seems to be working as do all the lights on the motorhome including signal lights, back ups, brake lights and hazards.

Fuses and relays in this box are for ABS, Ignition, exhaust brake, Power back up, Engine S and Engine M and something called Power TCM which we think is the transmission cooling module.There are three in line fuses either 30 or 60 amp in the compartment also which test out fine--All the fuses in the compartment test out fine.

We have tried to trace the wiring back from the plug but unable to see it.

Anyone out there have the wiring for the 2006 Monaco Caymen or have any more suggestions
By you saying "no power to the plug, do you mean there are no 'trailer' turn signal voltage, no 'trailer' stop light voltage, no trailer' running light voltage, and no 'trailer' 12 volt supply?

If there is no power at the trailer plug at all for all of these things, then I would first look closely at the back end of the plug for corrosion and broken wires/connectors. Then look for a multi wire connector close to the trailer plug that may have corroded/broken wires.
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Old 09-14-2020, 04:55 PM   #4
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Quote:
Originally Posted by jloberg27 View Post
WE have no power to the plug. We are focusing on the module called monaco 3 in the second from rear bunk on the curbside of the unit.WE have looked at the diagrams u have so kindly provided but they dont match ours.

The relay is up in the front fuse box but seems to be working as do all the lights on the motorhome including signal lights, back ups, brake lights and hazards.

Fuses and relays in this box are for ABS, Ignition, exhaust brake, Power back up, Engine S and Engine M and something called Power TCM which we think is the transmission cooling module.There are three in line fuses either 30 or 60 amp in the compartment also which test out fine--All the fuses in the compartment test out fine.

We have tried to trace the wiring back from the plug but unable to see it.

Anyone out there have the wiring for the 2006 Monaco Caymen or have any more suggestions
[Mod Edit].

That said, I may be able to offer some help, if you'd like, but I'm a little confused by exactly what your problem is. When you say you have no power in the plug, do you mean that you have no lights coming on in whatever you are towing, or do you specifically mean only the wire in the tow harness that has a constant 12v+ to power things other than toad or trailer lights? Do you have a volt meter or a continuity tester to test the poser at the motorhome pigtail socket?

Also, the fuse box you mentioned in the the third paragraph that feeds the exhaust brake, ignition, TCM, etc. sounds like it should be in the front of your motorhome under the driver's seat, rather than the rear power box likely located in one of the curbside rear compartments. The fuse box you are looking for is mounted on the back bulkhead of one of the curbside rear compartments (if it's the same as my 07 Diplomat was). TCM likely means Trans Control Module which is up front, as is the exhaust brake circuitry.
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Old 09-15-2020, 01:47 AM   #5
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HI everyone thanks for your quick help. we have no lights of any kind working on the tow vehicle-- upon testing there is no power to the trailer plug or a connector not far back from the plug. we have tried to trace the wiring back from the connector but can't see it.

Thanks for the advice about the relay being up in the front fuse box. Do you know what it would be called on the box or cover?

and thanks for the link to wiring diagram-- will check that out for sure-- thanks everyone!!
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Old 09-15-2020, 01:48 AM   #6
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And will also check for corrosion or bad connection near the trailer plug and connection not far from it-- all great leads thanks everyone!!
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Old 09-16-2020, 10:23 AM   #7
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Hi thanks — we have the same diagram but don’t see any fuse in there that would be for the pigtail. Are we missing something? Appreciate your help
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Old 09-16-2020, 10:44 AM   #8
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Originally Posted by Bigd9 View Post
By you saying "no power to the plug, do you mean there are no 'trailer' turn signal voltage, no 'trailer' stop light voltage, no trailer' running light voltage, and no 'trailer' 12 volt supply?

If there is no power at the trailer plug at all for all of these things, then I would first look closely at the back end of the plug for corrosion and broken wires/connectors. Then look for a multi wire connector close to the trailer plug that may have corroded/broken wires.
Hi, U r correct -- no power to pigtail or connector just back from pigtail as determined using 12v power indicator. When we examined the pigtail plug itself and the connector about 2 feet back they look fine.

Do you think the trailer lights are spliced into the coach rear lights or do they run to a switch or fuse somewhere else.

The coach lights are all working fine.

thanks a lot
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Old 09-16-2020, 10:47 AM   #9
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Originally Posted by l1v3fr33ord1 View Post
jloberg27-

According to the manual for your coach (link here), page 208, the Monaco #3 box is in the front of the coach. Per page 209, the trailer fuses are in that box.

Hi u r right and that box is up front -- we just dont see any fuses or relays in there that relate to the pigtail--are we missing something thanks
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Old 09-16-2020, 10:50 AM   #10
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Originally Posted by l1v3fr33ord1 View Post
jloberg27-

According to the manual for your coach (link here), page 208, the Monaco #3 box is in the front of the coach. Per page 209, the trailer fuses are in that box.
Quote:
Originally Posted by Bigd9 View Post
By you saying "no power to the plug, do you mean there are no 'trailer' turn signal voltage, no 'trailer' stop light voltage, no trailer' running light voltage, and no 'trailer' 12 volt supply?

If there is no power at the trailer plug at all for all of these things, then I would first look closely at the back end of the plug for corrosion and broken wires/connectors. Then look for a multi wire connector close to the trailer plug that may have corroded/broken wires.

Ok thanks and yes no power at pigtail or connector near the pigtail at all as per 12 volt tester. But all rear coach lights work fine. Connector and pigtail itself look good.
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Old 09-16-2020, 10:56 AM   #11
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Originally Posted by Robin_M View Post
[Mod Edit].

That said, I may be able to offer some help, if you'd like, but I'm a little confused by exactly what your problem is. When you say you have no power in the plug, do you mean that you have no lights coming on in whatever you are towing, or do you specifically mean only the wire in the tow harness that has a constant 12v+ to power things other than toad or trailer lights? Do you have a volt meter or a continuity tester to test the poser at the motorhome pigtail socket?

Also, the fuse box you mentioned in the the third paragraph that feeds the exhaust brake, ignition, TCM, etc. sounds like it should be in the front of your motorhome under the driver's seat, rather than the rear power box likely located in one of the curbside rear compartments. The fuse box you are looking for is mounted on the back bulkhead of one of the curbside rear compartments (if it's the same as my 07 Diplomat was). TCM likely means Trans Control Module which is up front, as is the exhaust brake circuitry.
Hi Rob, Yes you are right--we have no lights at all coming on in the tow vehicle but all rear lights work fine on the coach. There is a fuse box in the rear curbside compartment called monaco 4 but nothing in there we see that would relate to the pigtail. Do you know what that fuse for the pigtail would be called? thanks
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Old 09-16-2020, 02:04 PM   #12
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Hi u r right and that box is up front -- we just dont see any fuses or relays in there that relate to the pigtail--are we missing something thanks
The manual shows the locations of the fuses in Monaco 3 and 4 on page 209. The picture below is from the manual; I have put a red oval around the trailer fuses. Does that drawing match your Monaco 3 box?

Pictures of the interiors of Monaco 3 and 4 would help.
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Old 09-16-2020, 10:07 PM   #13
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Quote:
Originally Posted by l1v3fr33ord1 View Post
The manual shows the locations of the fuses in Monaco 3 and 4 on page 209. The picture below is from the manual; I have put a red oval around the trailer fuses. Does that drawing match your Monaco 3 box?

Pictures of the interiors of Monaco 3 and 4 would help.
Hi and yes our monaco 3 box is just like your photo--those three fuses are good according to our 12v tester.

Didn't know that they related to the pigtail though -- and sure appreciate your continued help Mark. Thumbs up to you
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Old 09-17-2020, 05:07 AM   #14
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jloberg27-

Attached find a chassis wiring diagram for the 2006-7 Cayman with an Allison 2500 transmission. The coach hitch connector appears in Zones H5 and H6.

You can work backwards from there to find the relays and fuses that send the left turn-stop, right-turn stop and marker light signals to the hitch connector. Working further upstream eventually brings you to the turn signal switch in the dash.

Some questions:

1) The fuses may be "good," but do you get 12V on the upstream side of each of them?
2) Do you get 12V at the inputs of the relays?
3) Do you get 12V at the outputs of the relays?

An easy way to send a signal to all the turn lights (coach and hitch connector) is to activate the hazard flashers.

If you have 12V through the relays I would disassemble the coach hitch connector and look for loose or corroded wires there.
Attached Files
File Type: pdf 2006-2007 38061841 Cayman Neptune chassis.pdf (421.9 KB, 3 views)
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