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I have a 91 t400 kenworth. Having trouble with running lights and dont know what relay to check and see if it is bad any help would be appreciated

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The relays are under the kick panel under the dash on the driverside, the fuse is also a circuit breaker just push the reset button and they should work

Posted on Dec 09, 2016


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there is a relay under the hood in the fuse/relay panel called drl, or daytime running lamps, that relay is most likely bad, a good way to tell is switch it with the high beam relay, if they come on you know thats it, if they dont, its the relay for the lowbeams, again switch it with the high beam relay and see.. either way i can tell you for sure one of those two are bad... but most of the time it is the daytime running lamps, or sometimes called driving lights relay. hope this helps you

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