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08-08-2021, 02:53 PM
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#1
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Member
Join Date: May 2018
Posts: 35
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No brake lights
97 Fleetwood discovery 36a. No brake lights. The turn signals, hazards, and parking lights work. I have power at the brake light relay. I also have a 3rd brake light that works. Is there another relay that I don't know about? The 3rd brake light works on a red wire, the other brake lights have a yellow or green which also work the turn signals. Does anyone have a wiring schematic for this chassis. I have one for the coach but it doesn't have enough info
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08-09-2021, 09:20 AM
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#2
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,982
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My chassis has a separate brake fuse. Only the brake lights would not illuminate.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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08-10-2021, 05:31 PM
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#3
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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Quote:
Originally Posted by chrgnu
97 Fleetwood discovery 36a. No brake lights. The turn signals, hazards, and parking lights work. I have power at the brake light relay. I also have a 3rd brake light that works. Is there another relay that I don't know about? The 3rd brake light works on a red wire, the other brake lights have a yellow or green which also work the turn signals. Does anyone have a wiring schematic for this chassis. I have one for the coach but it doesn't have enough info
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I guess you checked bulbs and sockets? Does the trailer light connection work?
__________________
2007 Fleetwood Revolution LE 40V
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08-10-2021, 06:01 PM
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#4
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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On a 1997 chassis, if the 3rd or cyclops brake light works but the side brake lights do not work, then chances are excellent the diode in the wiring harness is burnt out. In that year+- Freightliner designed the brake lights with a diode only large enough to accommodate the coaches brake lights. When you add a toad brake lights to the circuit the diode usually fails.
The diode is sometimes a challenge to find. Generally is is inside a wire bundle near the steering column. Search this forum for the diode and cyclops light and you will probably find a lot of hits back from that era.
Let me know if you need anything
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun 
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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08-19-2021, 06:43 AM
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#5
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Member
Join Date: May 2018
Posts: 35
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I found the diode, it is bad when tested. Where is a good place store or online to get a higher amp replacement?
Thank for all of your help/replies
Freightliner has great wiring diagrams for free that really helped me.
EDIT i found a place online that sells Roadmaster 690 Diodes for $10
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08-19-2021, 08:23 AM
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#6
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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When I replaced mine, I used two 10 amp? diodes in parallel. I got mine from Radio Shack . They were everywhere back then. I see 10 amp diodes on Amazon for real cheap. But the one you found would probably work also.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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08-19-2021, 08:37 AM
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#7
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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Looks like brake light bulbs use about 2 to 3 amps each. So with two bulbs on the coach, and two on the toad you would probably need a 15 amp diode.
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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