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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 07-26-2009
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alvahall alvahall is offline
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Default Parking Lights and Tail Lights Out

Hello, I'm having a problem with my parking light and tail light circuit. I have the split headlight/parking light switch. Nothing comes on with just the parking light half of the switch pushed, but the headlights come on when the whole switch is pushed. I get 12 volts from the switch when the parking light half is on. My schematic shows that the breaker for the lights is #20 in the Lower Front Load Center, however unlike most of the other breakers in the compartment, the wires don't match the diagram. At any rate, all of the breakers are passing 12 volts, so the breaker must not be the problem. I'm sure there must be a relay in the circuit, but I don't know where it is. There are several in the load center, but the load center diagram doesn't show any. Can anyone tell me which relay to check? Thanks
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Old 07-26-2009
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Hi John,

On our 88 FC the relays are behind the access panel, above the driver side headlight. That GM headlight switch has been know to be a problem, available at NAPA
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  #3  
Old 07-26-2009
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Default Tail Lights Out

Thanks Bill, It WAS the switch. I was sure it wasn't because I got 12V at the proper terminal when it was switched on. Shorted across to the 12V input and got a headlight warning buzzer and light. Went outside and sure enough, all the lights were working. Thanks for the advice, I'll go to NAPA first thing in the morning.
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  #4  
Old 07-26-2009
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Bill, Do you remember what information you gave to NAPA to look up the headlight switch? There are no numbers on it, only the name Delco-Remy.
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  #5  
Old 07-26-2009
Stephen Stephen is offline
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Take the switch with you and match it by sight

there is a pushbutton on the side of the switch
push button pull knob on switch to remove then
take out switch
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Old 07-26-2009
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John,

If it is the split rocker type switch and not the push/pull round knob,
Try this number at NAPA HL6669 about $20.00.
Take the switch they will match it, Talk to a person over 50 years old.
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Old 07-26-2009
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I am chucking at Bill's comment to find a parts man over 50> I am over 60 and used to be a parts man in my youth. When someone came in with a switch we simply opned the Echlin ccatalog to the area with pictures and part #'s. Sometimes we simply took the switch to the parts room and matched it. But today things are different:

Customer: I need this switch

Part man: What is the VIN

Customer: It is not from a car. It is a Bluebird

Parts man: 2 door or 4 door

Customer: IT IS NOT A **** CAR!

Parts man: 4 cyl or v8

Customer: I TOLD YOU IT IS A BLUEBIRD

Parts man: We do not have parts for School Buses

Customer: ( comments deleted)


Bruce
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  #8  
Old 07-26-2009
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Thanks for the help guys. That's why a needed a little information before I go to NAPA. I remember going to parts stores over 40 years ago and the parts man could tell me how to install the part and not to do this or that while installing. The guys at the local store look like teenagers. I've been searching the internet for the last couple of hours and have found out a few things. The switch is an AC Delco D1505B. It was used on GMC 3500 pickups from 94 to 99. It was also used on the 89 Buick Century and some Blue Bird school buses, so it should be available for a while. Thanks again.
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  #9  
Old 07-26-2009
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dont forget the push button
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  #10  
Old 07-27-2009
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If you can't find the OLD PARTS GUY, try working with the young guy, or gal if they are willing by offering to look through the parts books with them at all of the pictures of parts, it can become a learning experience for both parties involved, I recently found two switches that way at NAPA. If you look at the pictures long enough it may give you double vision and that can turn into the Gearhead Rorschach Test

Remember the OLD PARTS GUY or GAL wasn't always OLD they had to start out somewhere and usually at a younger age
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