Quote:
Originally Posted by Chance
The diagram posted above clearly shows that the emergency start switch operates the Trombetta (brand name) isolator relay. The emergency start switch sends control current to close the Trombetta relay. There is no way that engine starting current, which would be in the 100s of Amps, could go through the emergency start switch itself which is limited to something like 5 Amps.
The reason these Trombettas are used is that they are available to handle very high current. Some models go up to at least 800 Amps, which should easily start a V10 engine.
When you depress the emergency start switch, a very low current (less than 5 Amps) will flow from the house batteries to the coil on the Trombetta (brand) relay, which in turn CLOSES the main contacts that allows 100s of Amps to flow from the house battery to the engine starter (assuming you are cranking the engine).
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This is correct, all the Trombetta does is tie the two battery systems together when called to do so. On ours from the chassis positive battery post are 3 wires, 1 goes to the starter, the second goes to the Trombetta( isolation relay), and the 3rd looks like it goes to the under hood fuse box.
Again this is for ours, the Thor battery connection drawing(house batteries) shows the isolation relay within the house battery compartment when it is actually under the hood next to the B.I.R.D.
The Intellitec drawing shows two latching relays and the isolation relay. But per that drawing I am unable to find the latching relay they show for the chassis battery. The house battery latching relay used to disconnect the house batteries from the coach load center on ours is somewhere between the kitchen sink and the load center( distribution panel) at floor level
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