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Intermittent 12v issues

BuiltMFG

Member
148
5
18
Location
Denver, CO
I installed dome 12v LED lights on the truck. If I flip the main power switch on the truck next to the batteries they now come on for a moment then they turn off (they are wired 12v constant). When driving the dash lights act as if they are not getting enough power and and once cut off entirely (12v switched). Outside of that the truck starts and drives great. Am I wrong in saying this is a 12v issue only? Any thoughts or past experiences are appreciated.
 

Suprman

Well-known member
Supporting Vendor
6,861
696
113
Location
Stratford/Connecticut
The dash illumination goes thru a dimmer switch on the lower right of the dash panel. They can become intermittent. Have you measured the power going to your light with a multimeter?
 

BuiltMFG

Member
148
5
18
Location
Denver, CO
I traced the issue back to the Terminal block behind the tire. No issues with 24v, but no 12v coming out of this.


Sent from my iPhone using Tapatalk
 

Suprman

Well-known member
Supporting Vendor
6,861
696
113
Location
Stratford/Connecticut
If you have 12v in and no 12v out then the block is bad. Its just a diode array that prevents someone from blowing up the cab electronics if they put the batts in backwards. You can bypass it. Just dont install any batts backwards.
 
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