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Relay Sticking In Cold Weather Ch 613

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I have a problem with a 99 mack ch 613 with a e7 400hp when you go to start it on a cold day like below zero you turn on the key and try starting it and it will not fire then you shut the key off and the parking brake light and the low air pressure lights stay on and will not shut off untill you disconnect the battrey then sometimes you can get it to start when you hook up the battrey but it will not start if that relay is sticking the only problem is I cannot find the relay that is sticking I tried unpluging one by one the relays under the hood but it is not one of them where are the other relays that could be causing the ignition sticking problem?

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