| Re: [GMCnet] starter wiring [message #229223] |
Sun, 10 November 2013 23:13  |
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hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma:
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Senior Member |
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Mike
Where in the back is the second solenoid located?
I have never seen one on ours. "74 Canyon Lands"
Thank You
Alpine Ca
74 Canyon Lands.
All is well with my Lord
> On Nov 10, 2013, at 17:40, Mike Miller <m000035@gmail.com> wrote:
>
>
>
> Chris Tyler wrote on Sun, 10 November 2013 12:54
>> ...
>> Back to how I wired the boost switch, there were several SOB coaches that worked that way back in the day, and don't really see a downside to it.
>
>
> I'll explain how the stock '75 and up GM coaches boost system was wired and a little on why. You'll need to figure out how the 3rd battery on yours was added and how it effects your systems.
>
> GM noted that the separate generator starting batteries in the early coaches was often dead when owners wanted to start the gen-set. (From lack of generator use.) So they eliminated the third battery by moving the house battery to the rear so it could be used for double duty. As the house battery was charged both when driving and when plugged in, it would be more likely to have some charge when the gen-set needed to be started.
>
> Fine so far, but to maintain the boost feature a large cable was needed from the house battery to the boost switch up front.
> This worked but it isn't that good a practice to have a large gauge cable connected directly to the battery without any over current protection. So they added a second solenoid in the back. (If the cable is shorted somewhere between the the operator will know it when he presses the boost switch and the solenoids will loose power. One reason for a momentary boost switch.)
>
> Now they needed to get the charging current from the engine alternator to the batteries in the rear. So, why not use the big cable that is already there? A circuit breaker jumping the rear solenoid was all that was needed to provide a path for the charging current going into and the house power coming out of the battery.
>
> One last thing is on a GM upfitted coach from 1975 on. There is also a connection lug mounted on the wall behind the converter in the hallway cabinets. This is a common connection from the rear solenoid, the front solenoid and the house fuse panel/converter. The cable from that point forward has been a problem on some coaches.
>
> I suspect your PO has connected an additional battery in parallel with one of the two battery banks. While it does work, it is very hard to get balanced for any kind of battery life.
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>
> --
> Mike Miller -- Hillsboro, OR -- on the Black list
> (#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
> http://m000035.blogspot.com
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