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M818 Stop light problem-NEED HELP!

Autocar

Member
260
16
18
Location
California
I just won an M818 and got it home. Have a weird problem with stop lights that hopefully someone can help with. The rear turn signals work on both sides(L & R) with the headlight switch in both positions- Service Stop and Service Drive. The problem is that the R Stop light works correctly in both headlight switch positions, but the L Stop light doesn't work in either postion. I don't have a wiring diagram, but I figure that since the stop and turn bulb are the same, if one works , the other ought to work. Any ideas?
 

Autocar

Member
260
16
18
Location
California
Checked the bulbs. Both filaments good. There is only one center pin on the bulb so the filaments are redundant. This means that for some reason power does not get to the bulb.
 
Last edited:

cjtroutt

CW2 26 BDE HHC S6
Steel Soldiers Supporter
756
4
18
Location
C.G. JMTC MICHIGAN
I would check the Ground & the signal stat switch May have corrosion problem.
Just went through this on M915A3 That was in an flood water Detroit Diesel S60 500Hp
it was an mess Grounds & lots of dielectric grease to fight the problem.

Can be in the cab wire connectors.
 
Last edited:

bigelk50

New member
932
13
0
Location
albany, Or
Make sure that the blinker switch had a good ground to the steering column. It grounds by the clamp that holds it on. Then check the contacts in the switch. sounds like a ground/contact problem.
 

gimpyrobb

dumpsterlandingfromorbit!
27,785
751
113
Location
Cincy Ohio
He said he has one of the lights working. That means the circuit is active, just one housing isn't working right. Check for voltage with the peddle pressed.
 

cranetruck

Moderator
Super Moderator
Steel Soldiers Supporter
10,350
75
48
Location
Meadows of Dan, Virginia
I just won an M818 and got it home. Have a weird problem with stop lights that hopefully someone can help with. The rear turn signals work on both sides(L & R) with the headlight switch in both positions- Service Stop and Service Drive. The problem is that the R Stop light works correctly in both headlight switch positions, but the L Stop light doesn't work in either postion. I don't have a wiring diagram, but I figure that since the stop and turn bulb are the same, if one works , the other ought to work. Any ideas?
Here you go (wiring diagram).

On plastic housings, both mounting screws must be grounded.
 

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