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Old 12-02-2014, 01:41 AM   #1
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Battery interconnect relay question

On my coach I have a relay that ties the chassis and house bank for boost and charging while underway. Sometimes when I start the house voltage does not go up indicating not activation. It I push the boost button once it stays latched. The symptoms to me seem to indicate either a weak ground signal from the pressure switch or a week relay. I have a spare relay I will install . Have any of you heard of this problem.
Rod
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Old 12-02-2014, 10:01 AM   #2
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If your coach has a BIRD system or similar, to interconnect the battery banks. The solenoid activation can be delayed by the state of charge of the chassis batteries, even activation of the manifold heater in cold temps will hold up activation.
The BIRD controller wants to see, over 13.1v at the chassis batteries for over a min. before it activates the solenoid to connect the coach batteries.
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Old 12-02-2014, 02:47 PM   #3
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Quote:
Originally Posted by IASM View Post
On my coach I have a relay that ties the chassis and house bank for boost and charging while underway. Sometimes when I start the house voltage does not go up indicating not activation. It I push the boost button once it stays latched. The symptoms to me seem to indicate either a weak ground signal from the pressure switch or a week relay. I have a spare relay I will install . Have any of you heard of this problem.
Rod
Rod
Year and model of coach?
Are you sure there is a relay (aka: solenoid), to cause/allow the house batts to charge via the alternator while underway?
You probably have either a solid state "isolator" or another solenoid for charging the house batts when underway, (in addition to the "boost solenoid).
Normally the "battery boost solenoid", (which ties the house and chassis batteries together for boost), has nothing to do with the charging of either bank of batteries.
In other words the battery boost solenoid and whatever componant causes/allows the house batteries to charge via the alternator while underway are usually 2 separate components.
Mel
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Old 12-02-2014, 03:26 PM   #4
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He has a late model Country Coach--probably a Magna from the picture, so his house batteries should definitely charge from the alternator while underway--ours does.
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Old 12-02-2014, 04:27 PM   #5
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Sometimes.... The chassis battery gets run down a bit.
now: there are several types of isolators (The relay you cite)

ONe, reads the status of the ignition switch, If Ignition and accessory both on,, Connect

Some read the voltage, if 13+ connect (NOTE: I picked that voltage out of think air, the actual set point varies with designer, that is what I would use)

Some, read both sides, if either side is 13 plus, CONNECT, (We call that a BIRD,, Bidirectional Isolator Relay Device or Delay depending on which part of the system we are talking about) The delay requires 13.6 for like 30 seconds.
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Old 12-02-2014, 09:41 PM   #6
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It is a 500 amp Kissling relay. On the activation circuit it has power on one side and two wires on the other. One going to dash switch and the other going to an oil pressure switch. When the boost switch is activated it activated relay. When started the oil pressure switch wire does go to ground but sometimes does not activate the relay. If I push the boost switch it activates and latches the relay and stays latched. My thoughts are either the ground is not solid enough to activate the relay via the oil pressure switch or the relay is not happy. Its seems odd that such a simple system is giving me trouble. It would make sense if it didn't stay latched.
Rod
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Old 12-03-2014, 08:04 PM   #7
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Rod, I think you are right that the ground on the oil pressure switch is the cause of your problem. I had a similar problem on the Allure I used to own. I cleaned up all contacts points on the relay and on the pressure switch and my problem went away.

Good luck.
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Old 12-03-2014, 09:08 PM   #8
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I would be looking at the oil pressure switch
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Old 12-03-2014, 09:20 PM   #9
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Get a voltmeter and carefully measure the voltages and you will know what us going on.

This is simple.
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Old 12-03-2014, 09:44 PM   #10
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The voltages are good and I checked the oil pressure for making ground and it did go to ground once started. Im going to re-check but im thinking perhaps not enough amps going through the oil pressure switch to activated the relay but does provide enough to hold. I think it will wire a test light to check capacity of the oil circuit .I do not know the location of the switch yet. Kind of fun trying to troubleshoot this stuff.
Rod
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Old 12-03-2014, 09:56 PM   #11
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You did not check properly...

Follow me...

Say it is in run mode.

Engine running, 12 volts to relay control hot and relay control ground sourced by oil pressure switch.

Should see 12 volts across coil and coil should operate.

If "not enough amps flowing" then something has too much resistance and will result in an incorrect voltage.

So assume oil sender bad...

Instead of zero volts you measure 5 or 2 which indicates resistance instead of closure.

Also are you sure correct sensor?

A guage sensor will be resistive snd you check with ohmmeter with no wire connected and engine off then start and see what it reads as well as varying engine speed.
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