msbulldog601 Posted July 11, 2023 Share Posted July 11, 2023 (edited) Hello i have a 92 Mack CH 613 Daycab I haven’t used the truck in about a year it usually fires right up with turn of the key. I noticed the last time I crank the truck and turned it off a few days after I came to the truck that the roof light was on so I turned it off didn’t think to turn the truck on. Few weeks later I went to the truck to turn the truck on No start I turned over slowly so I said it must be the batteries I hooked to my other truck for boost with jumper cables it would turn on but turn off after I get off the accelerator. I didn’t have much time to investigate that day. I came back a few weeks later put the key in the truck it’s all the way dead so I went got my new batteries out of my other Mack same model placed in that truck and it’s still dead turn key forward no lights come on dash like I didn’t turn the key forward what could be the issue? Thanks for your help. Edited July 11, 2023 by msbulldog601 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted July 11, 2023 Share Posted July 11, 2023 Rotten battery ground cables... String enough to light a light bulb, but can't carry amps for cranking.. there is an acc. Relay behind the center of the dash under the cup holders.. it looks like a Ford starter relay.. 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted July 11, 2023 Share Posted July 11, 2023 1 hour ago, Joey Mack said: Rotten battery ground cables... String enough to light a light bulb, but can't carry amps for cranking.. there is an acc. Relay behind the center of the dash under the cup holders.. it looks like a Ford starter relay.. i second the relay Quote Link to comment Share on other sites More sharing options...
msbulldog601 Posted July 11, 2023 Author Share Posted July 11, 2023 3 hours ago, Joey Mack said: Rotten battery ground cables... String enough to light a light bulb, but can't carry amps for cranking.. there is an acc. Relay behind the center of the dash under the cup holders.. it looks like a Ford starter relay.. Thanks I will go take a look today and get back with you always very helpful and i appreciate you! Quote Link to comment Share on other sites More sharing options...
msbulldog601 Posted July 11, 2023 Author Share Posted July 11, 2023 2 hours ago, fjh said: i second the relay @fjhthanks for always responding and helping as well. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted July 11, 2023 Share Posted July 11, 2023 There should be a ground breaker, on the firewall, and next to it is the starters relay. There is a big ground on the engine block in front of the starter. And one from there to the frame behind the steer tire... Jojo.. 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted July 11, 2023 Share Posted July 11, 2023 The ground breaker can simply be by passed to get out of a pinch! Also if it does turn out to be the relay ! Make sure you’re given a constant duty relay cole Hersey is a common replacement and they make both and look identical! 1 1 Quote Link to comment Share on other sites More sharing options...
msbulldog601 Posted July 18, 2023 Author Share Posted July 18, 2023 On 7/11/2023 at 6:11 AM, Joey Mack said: Rotten battery ground cables... String enough to light a light bulb, but can't carry amps for cranking.. there is an acc. Relay behind the center of the dash under the cup holders.. it looks like a Ford starter relay.. Can you take a look at the pictures maybe I’m over looking the relay in the center of dash under the cup holders Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted July 18, 2023 Share Posted July 18, 2023 Turn the key on and listen for the click, then maybe you will find it.. you may have a small cube type relay in the fuse panel, but I don't remember what year they switched to that. Quote Link to comment Share on other sites More sharing options...
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