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Old 05-02-2015, 10:51 PM   #15
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Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Mar 2009
Posts: 1,636
Originally Posted by stillamook View Post
I have a 1999 fleetwood storm,31 foot motorhome on a ford chasis. It has 40,000 miles.
1. The alternator will apply a charge to the 12 volt chassis battery but will not charge the two 6 volt house batteries.
2. When connected to ground power the 120 VAC/12volt converter will charge the two 6 volt house batteries but will not charge the 12 volt chassis battery.
3. The house battery isolation relay makes the expected "clunk" sound when the rocker switch is cycled on and off.
4. Th chassis battery isolation relay does not make any sound when the rocker switch is switched on and off.
I did read another thread about a person having continuous problems with chassis battery isolation relay but did not get the final result and solution.

Help please.
Items 1 and 2 certainly point toward a problem with the isolator/aux start/charge solenoid (relay).

In items 3 and 4, you would be well advised to refer to those solenoids (relays) as the "Battery Disconnect relays" rather than "Isolation relays" as this could be very confusing to someone familiar with the BCC operation attempting to help troubleshoot your problem.

A quick test of the charging system, to determine if the Isolation/charge relay is BAD, is to press and hold the Aux Start Switch while observing if both battery banks are being charged by shore and alternator power.

Here is a very detailed troubleshooting and service document for your Battery Control Center) BCC.

Let us know if you need further assistance.
'97 Bounder 34V, F53 7.5L-460

'97 Bounder 34V, F53 7.5L-460
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