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Can't get M1078 started...

Spdracr

Member
31
0
6
Location
Altus, Ok
I was messing around and was looking at the breakers and saw a starter interrupt button. I pushed it and the truck would not start. Pushed it again and it started. Waited about ten more minutes and would not turn over. Is there some trick that I missed. Looked in operators manual and cant find anything on it. Everything was working fine until I messed with this and now nothing. Wont do that again. Any ideas on what is wrong? I can feel the starter relay hit and juice is good just nothing hitting the starter. Thanks...
 
Last edited by a moderator:

Spdracr

Member
31
0
6
Location
Altus, Ok
Do you mean the master on the dash? If so have all ready. Do you mean another master switch? Everything clicks like it should just no start.
 

Spdracr

Member
31
0
6
Location
Altus, Ok
Tried pushing the button multiple times. Even found relay that it powers or doesn't power and switch relay with another relay and still no start. Can even hear something click and unclick under cab when push the interrupt button over and over. Turn off power and cycle again over and over and still not turning over.
 

Suprman

Well-known member
Supporting Vendor
6,860
693
113
Location
Stratford/Connecticut
Measure make sure you have 12 and 24 volts
at the panel left lugs. Manually open the cab and jump the aux start solenoid drivers side frame rail see if it starts. Have power switch on or it will just crank. Could be a bad relay in the panel or something simple. You could also jump the starter relay take it out and touch a wire top to bottom of the socket.
 

Spdracr

Member
31
0
6
Location
Altus, Ok
Transmission controller is lit up and can feel all the starter relays hitting. Clicking under the cab like the solenoid is hitting but not turning over. Maybe solenoid but I will try what you guys said first.
 

Suprman

Well-known member
Supporting Vendor
6,860
693
113
Location
Stratford/Connecticut
If the starter solenoid is engaging but not turning over it could be due to weak batteries. Someone else I know had this issue recently.
 

Spdracr

Member
31
0
6
Location
Altus, Ok
Walked out side after dinner and it turned over. Didn't start. I changed back the horn relay and starter interrupt relay and tried again and it hit and started. Tried three times and still started. Read somewhere maybe a thermal switch on starter relay? Anybody know about this?
 

scottmandu

Active member
822
36
28
Location
Texas
Jumper the start relay and this will tell you if the starter relay is bad or not. If it starts then it's the relay or the switch or something in between. Also it's critical that battery voltage is above 24V.
 

Spdracr

Member
31
0
6
Location
Altus, Ok
Got it running. Not exactly sure what was causing it. Has been starting fine. Going to get some extra relays and if it happens again, maybe that is it. Thanks...
 

Ue413

Member
205
2
16
Location
Springfield, Missouri
Spdracr..... I've got same issue truck attempts to start but does not. I can hear start relay clicking and assume is bad. Can you let me know where you picked up relay and associated part number?

thanks!
 
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