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Old 09-05-2019, 12:37 PM   #1
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BIM question

I have a 2004 Winnebago 35U. The boost solenoid is confirmed bad. The LR lead gets power when the boost switch is pressed and when the IGN is in run. It clunks but taking voltage readings on the coach and chassis terminals shows the solenoid contacts are bad.

It is a:

Trombetta 936-1215-011-21
Winny Number 008188-01-000

I talked to Lichtsinn parts. They have the original solenoid in stock but I'm not interested in that.

The solenoid, 008188-01-000 and in stock.

If I replaced it I would go with a Cole-Hersee 24213.

I asked about a trik-l-start if I did replace the solenoid. They have one in stock. Winnebago replacement for the trik-l-start according to them is 174291-01-000. Its listed as a battery isolation manager and has since been replaced by.

332068-01-000 0001733085 225amp
332004-01-02b mtg plate
332005-01-02b angle mtg

I looked at a 2019 Adventurer wiring diagram and that part shows up. It appears to be a BIM by Precision Circuits. Could be there solid state BIM 00-10041-250. Why the two mounting plates I don't know. They are used on the 2019 Adventurer.

I would be interested in this BIM as it would also charge the chassis batteries while on shore power. I asked Lichtsinn parts if this would work in my 2004. They suggested it but referred me to Winnebago tech support. I have called but have not gotten through as yet.

I looked at the PDF for the BIM. It has a IGN and SIG terminal. I only have the yellow LR wire to my boost solenoid. I have traced the LR wire in the wiring diagrams the whole way back to the boost switch. The boost switch has 3 wires. I'm not sure if the IGN run power travels through the boost switch to the LR wire.

I sent an email to Precision Circuits about there product. Got an email back form the president. He said I would need a home run from my IGN run and my boost switch. Not just the LR wire. I asked why I could just connect the LR wire to the IGN and SIG terminals on the BIM. Noting back in days.

I keep trying to contac Winnebago tech support to see why Lichtsinn suggested the 332068-01-000.

At the least I could go with Cole-Hersee solenoid and look at the trik-start or amp-start I guess. Since I need to replace the solenoid anyway I thought I would look at the solid state BIM.
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Old 09-05-2019, 01:56 PM   #2
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My 2017 Adventurer came with the BIM that keeps the chassis battery charged when on shore power (once the house bats are above 12.6v).

I can't tell you if it would work on your RV or not, sorry. When I bought my RV mine did not work and WBGO replaced it under warranty but it was at their factory in Iowa.
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Old 09-05-2019, 02:26 PM   #3
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Thank you. What I don’t know is what is the difference on the BIM SIG and SIG terminals. Wonder why I can’t connect my LR yellow wire to both of those terminals. My LR wire carries voltage of boost presses or ignition in run. President of Percision Circuits said I need a home run for IGN an SIG. but he didn’t say why. Yet Winnebago parts I talked to have me the BIM as an option but couldn’t confirm when I asked if it would work.
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Old 09-05-2019, 02:34 PM   #4
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Don't know if this will help but here's a link to a thread on IRV2 when I was trying to figure out my BIM not charging. Folks posted a number of photos and diagrams that potentially could be a help.

Plugged into shore power for 2-wks but chassis battery losing charge - iRV2 Forums

Also, Here's a photo of how it's connected in the Adventurer:
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Old 09-05-2019, 02:47 PM   #5
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Thanks as well. Hoping get on phone with tech support an get some answers. I can alway put in a silver contact boost solenoid and a trik-l-start or amp start. Right now I carry a battery tender an connect it to the chassis battery while on shore. I move the solar panel wire from the coach batteries to the chassis for as little as it helps.
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Old 09-06-2019, 09:52 AM   #6
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Well I just spoke to Winnebago tech support. They said they had no information on installing the BIM in my 2004 but would be interested in knowing? They refered me to George at Precision Circuits. That confirms that the BIM Lichtsinn quoted me is Precision Circuits.

I have another email into George to try and find out why he said I would need to separate my single LR wire into a separate runs from the boost switch and IGN run. My LR wire does both now so I don't know the different function of the BIM IGN and SIG terminals.

I can't tell yet from the wiring diagrams but it looks like the LR wire is a home run to the boost switch. There are two other wires to the boost switch. One appears to go to a 12V source that also feeds to cigarette lighter in the dash. I wonder if the third wire is from the IGN run and just connects to the LR wire right in the boost switch. Saving running two wires to the boost solenoid.

I think in the mean time I'm just going to replace my boost solenoid with a Cole-Hersee 24213.
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Old 09-06-2019, 10:36 AM   #7
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It just hit me. I bet the reason George said I needed a separate run from boost and IGN. Because the BIM would be confused if it saw voltage on both terminals at the same time. That is if I jumped the single LR wire to both terminals.
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Old 09-09-2019, 06:21 AM   #8
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I don't have your answers but I could use George's email for another problem I am having. Thanks!
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Old 09-09-2019, 06:52 AM   #9
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anndrennan - I sent you a PM with Georges's contact information.

I received an email from George about there BIM. He states if I don't separate the Boost switch feed and the IGN run feed there BIM will not work. I only have the single LR wire at the boost solenoid. I would have to figure where Winnebago merged those feeds into the LR. I suspect at the boost switch but I'm not sure.

In meantime I ordered a Cole-Hersee 24213 to get my boost solenoid working again. Should be here tomorrow.
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Old 09-09-2019, 07:27 AM   #10
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I did not get your private message. You can text me at 239-677-5530. Thanks!!
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Old 09-11-2019, 06:52 PM   #11
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cef2lion,
Well let's see, you have a 2004 Winne that JUST had the original Trombetta (or, has it been replaced prior?) go bad after what, 15 years? My original Trombetta lasted just over 12 years. I figure that's pretty good service, especially since the type of work it has to perform. It's up to you but, procuring one just like it, should, I say SHOULD give you a fairly equal service life but, no guarantees here. Just some thoughts here.
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Old 09-12-2019, 06:10 AM   #12
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I didn't go with a Trombetta. I installed a Cole-Hersee 24213 with silver contacts last night. Boost and house battery charging back in operation. Tested with my Fluke meter.

I don't know how long ago the Trombetta failed. I never used the boost switch and didn't know the solenoid also did the house battery charging while driving. I was reading some threads about BIMs and decided to check the solenoid.

I also completed my 30-50amp conversion last night. Tested and working. I received my EMS-PT50X portable surge protector. I also bought two dog bones. One for 30-50amp and the other for 15-50amp.

My dash air blend door wasn't working. It was a black vacuum line broken off coming from back of the engine to under the hood. Noticed on last trip and the dash HVAC fan would only run on high. Replaced the 30amp solenoid on the HVAC box and the other fan speeds are working now.

Ready to head out this weekend.
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Old 09-14-2019, 08:11 PM   #13
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Well, that works. When mine failed, I rebuilt it and it lasted for just over a year. So, I ended up getting the better Trombetta, also with silver contacts. It's been in there now for a couple of years and works like a charm.
Scott
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