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Old 05-29-2023, 07:25 PM   #1
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Charge Bridge

I noticed over the weekend that even though my silver leaf screen indicated that my house and chassis batteries were Bridged, my house batteries were at 13.5/13.6 and my chassis batteries were at 12.4. At that point, we were headed out for a couple of hours and when we returned, the house batteries were at 13.5 and chassis were at 13.3 and they were Bridged.

A couple of hours later, I noticed again that the chassis was at 12.4 and the house was at 13.5 and they were also bridged. It was dark and heavy rain last night so the quickest thing I could do was unplug Silver Leaf TM 102 for a minute and change the F10, 5 amp fuse in the KIB panel inside the electric bay. It seemed at that point that worked, overnight both remained within 1/10-2/10 volts of each other.

Today I checked the old fuse and it was good. Also the silver leaf voltage reading was similar to the day before: 13.5 house and 12.6/7 on the chassis, silver leaf was showing bridged.

I checked the voltage on the charge bridge, one side was 12.7(right side looking at it) and the other side (left side looking at it) was 13.6. I also checked the voltage at the chassis batteries and that matched what silver leaf was showing. The charge bridge is hot/to very hot to the touch.

When the chassis batteries get to 12.8 volts for longer than 60 seconds it shows them bridged (as it should). When the chassis batteries get to approximately 12.4 (I have not seen it lower than 12.4) that is when it appears that the charge starts to bring them back to within 1/10-2/10 volt of the house bank 13.4 volts. After a couple/several hours they drop back to 12.4, all that time they do show that they are bridged. Is this a charge bridge or a TM102 issue as seems that eventually the charge bridge does work?
Any help is greatly appreciated.
2020 London Aire 4543
2019 Dodge Ram 1500. Emerald Isle NC/ Old Beau Roaring Gap NC
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Old 05-29-2023, 08:44 PM   #2
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Newmar Owners Club
Spartan Chassis
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Sounds like your charge bridge is going bad. When Silverleaf shows bridging, check the voltage on the small terminals of the charge bridge. You should have 12V which is the signal to have the charge bridge engage. If your chassis battery post on the charge bridge is not showing the 13+ volts then the charge bridge is faulty. It may work intermittently.

You can also have someone push the battery boost rocker switch on the dash to engage the charge bridge rather than waiting for Silverleaf.
2018 Newmar Mountain Aire 4531
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Old 05-30-2023, 10:54 AM   #3
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Your charge bridge solenoid is going bad. You need to check the voltage at the solenoid. If you have a 1 volt drop across the terminals when engaged, it has failed and needs to be replaced.
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Old 06-06-2023, 05:13 AM   #4
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Change the charge bridge yesterday, all appears to be working properly. Thank you for responding. Safe travels
2020 London Aire 4543
2019 Dodge Ram 1500. Emerald Isle NC/ Old Beau Roaring Gap NC
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