Check for voltage at the heater outlet
On mine, the plug for the heater that goes into the 120v outlet doesn't make a good connection. It's on my list to replace. Find the plug and spread/squeeze the prongs for a better connection, then see if it switches over. If it does, then you too need to replace the outlet.
If that's not it, then the 120v heater is probably bad. Use an ohmmeter to check for continuity. If it reads open then the heater is bad, replace it.
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-Rich
Rich & Yvonne
2006 Safari SE -Dora-
2004 4Runner SE 4.7L V8
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