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Old 04-21-2011, 02:17 PM   #1
Alpine Owners Club
Join Date: May 2007
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Posts: 99
Apex h2o system

Had a no power to solenoids and then when I removed the TM102 for sensor update I had no power to the H2O pump. Found a bad relay, they are next to the fuse block in the tank bay, by tracing the wire from the 7.5 A Fuse for the
Water Fill to the relay.

Caution, the input and output plugs to the TM102 are interchangeable and you see no problem on the display, just keeps things from working.

Watch the wiring on the relay, it has two hot connections having a jumper from the 7.5 A Fuse wire to another blade.

12V wires go to blades 30 & 85, TM102 wire to 86 and last wire to blade 87

FYI, Silverleaf has promised an information sheet as to the what each pin is for and EMike will post it to the Tech Library.

Paul "Sully" Sullivan

40' MD Apex
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Old 04-22-2011, 07:00 PM   #2
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Sully - on mine there are three relays right next to the TM102, and it is a wiring nightmare the way WRV did those. One day I am going to trace them out, label them and put bigger guage on the ones which are underwired. It's an all day job, and I experienced the same issue when I installed one of the solenoids incorrectly, and messed up the pump, and lost power to it.

Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 04-22-2011, 07:17 PM   #3
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Here is a quick sketch of the relay & circuit Sully is discussing. I believe this is a typical Silverleaf circuit logic where the TM-102 operates a relay by grounding a relay coil that has 12V to it all the time.

I.e. silverleaf receives a "call" to operate something, grounds the appropriate pin on the 12 or so pin "output" harness, and the relay connected to that pin clicks on. Take ground away w/in the TM-102 and the relay clicks off. You may get some odd ohm & voltage readings on the TM-102 wires, as they come off computer circuits within, and probably don't read ground except when the computer is calling to ground that pin.
Attached Files
File Type: pdf Apex TM-102 Circuit Diagram.pdf (173.3 KB, 54 views)
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Old 04-22-2011, 09:10 PM   #4
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Thank you Mike.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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