BAC Forum
General Boards => Technical Support => Topic started by: Christian Fish on October 28, 2020, 07:01:02 PM
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I have noticed a difference in my battery switches. The house selector has a definite click as it hits detects for both on and off. The chassis selector has very little resistance to turning and no clicks or detects. Also I am able to start the engine with both switches selected off. Are these switches available and how difficult is it to change?
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I had to replace my House battery disconnect switch a month or so ago. I found that it had no "click" and it had a large voltage drop across it (about 1 volt drop) unless I moved the knob a little then I could get it to make good contact. The House and Chassis switches are the same, except the labeling.
If your Coach starts with the Chassis disconnect switch off, then I expect the knob has broken free and its not actually turning the contact plate inside so it is always in the On position internally.
I replaced it with a new Blue Sea Systems "m-series" switch (as recommended on this forum) and it is a perfect fit. It comes in Red or Black https://www.amazon.com/gp/product/B00445KFZ2/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
When I removed the old switch the "back fell off" and the contacts fell apart. It was only the battery cables pushing against the switch body that kept it from falling apart.
It was not hard to replace. On my coach I had to unbolt the Coach Power solenoid and move it slightly to get a socket on the battery stud. After that it was pretty easy.
This is what the old switch looked like when it came out (in two pieces). I plan to replace the Chassis disconnect switch too, just to be safe - but have not gotten to it yet.
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Thanks Mike, that's just what I needed to know. I ordered 2 switches.
Chris
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I just replaced the chassis switch. I noticed the plastic was slightly melted around the studs on the old switch. Also bypassed the Coach Power solenoid by placing both power leads on one stud