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Old 03-02-2015, 01:08 PM   #1
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Solenoid Question

2005 Alpine Coach 36 FDDS
What is the solenoid bolted to back wall of the battery compartment (actually in the engine compartment above the battery filler reservoir) do? What is it for?

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Old 03-02-2015, 02:12 PM   #2
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There is a very long thread on this forum that responses to your question--in fact, Dave's earlier input to your thread was pointing you in that direction. Not to cover old ground, but here goes--the solenoid on the back of the battery bulkhead is the secondary to the primary on the starter itself. The starter and primary solenoid are hot-wired to the battery bank via hi-amp cables. The secondary solenoid is tied to the ignition switch via low-amp wire [eg 10ga]. You can test whether the ignition switch is providing power to the secondary solenoid by testing the smaller ternminal[s] for voltage once the switch is placed in the start position. You can also see if the primary solenoid and starter will function by jumping the two large terminals on the secondary. Again, there is a substantial thread on this forum about the secondary failing [either open or closed]. If open, it wont start; if closed, the starter can run away and over heat....keep us posted.....

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Old 03-02-2015, 03:41 PM   #3
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There is also a large black solenoid for Battery Boost, which will connect both battery banks together to help start when one bank is dead.
Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 03-02-2015, 03:52 PM   #4
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Comment on solenoids in general. There are intermittent and constant use solenoids. A solenoid that shunts 150 Amp to a starter motor may burn out if a constant 30Amp load were applied.

If you are replacing a solenoid or developing a new wiring system or application be sure you know the max amp rating needed and the length of time those amps will be applied.
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Old 03-03-2015, 10:09 AM   #5
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Old Scout
I found that thread. Very Interesting. Thanks again.

TJ Shively
2005 Alpine Coach 36' FDDS
Cincinnati, OH
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