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Old 05-04-2011, 08:48 PM   #1
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High beam headlight problem

We have a 2001 Monoco LaPalma and Our high beam headlights will not come on, could that be caused by a ground fault? Where is the ground fault located so that we can check it?
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Old 05-05-2011, 07:57 AM   #2
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A few things can cause that problem...the multifunction dimmer switch is bad, the highbeam relay is bad or the connection to the relay is bad, or both highbeam filiments in the bulbs themselves are bad (that can happen).
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Old 05-09-2011, 09:27 PM   #3
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Check chassis fuses. Often different light functions have separate fuses in newer models.
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Old 05-09-2011, 09:58 PM   #4
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Headlights are not normally fused they always use self reseting circuit breakers so they will flash on and off and not leave you in the dark if something goes wrong.
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Old 05-10-2011, 09:03 AM   #5
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Assuming the low beams come on and they are the same lamp a ground fault is NOT on the list of suspects,, If they are different lamps, then it could be but the odds are very very slight.

more likely a bad hi/lo switch or one of the connectors.. If your switch is column mounted there is a connector alongside the collumn, (if it's floor mounted then it's on the switch) another at the firewall and possibly one more somewhere between the firewall and the lights.

There may also be relays.. If I were deisgning a vehicle I might well use relays to cut down the wire run.. (But I don't design cars) and if the high beam realay failed.. But I doubt such a relay exists since I've never seen them as standard, only as after market upgrades.
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Old 05-10-2011, 10:38 AM   #6
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A 'ground fault' refers to A.C. current. When you activate the hi beam switch with lights on does anything happen, like the hi beam indicator coming on or the fog lamps going out? Does your coach have the feature that when you activate the high beam switch with no lights on it will momentarily turn on the hi beams?
It's more likely the switch or relay that is enegrgized by the switch. What chassis do you have?
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Old 05-11-2011, 07:36 AM   #7
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We have a Ford Chassis. The high beam indicator does not come on either!
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Old 05-11-2011, 02:45 PM   #8
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Assuming you have a F-53 Chassis I was able to find this: Fuse # 35 powers the Hi beams only, 20amp fast blow. The fuse box will also contain one hi beam relay and one low beam relay. Inside the box cover usually indicates the population of the panel. If the fuse is good you'll have to check the relay to see if it works, this will indicate which side of the relay has the fault. Good Luck.
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