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Old 01-09-2018, 10:26 PM   #1
TruckYou
 
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Manual Grid Heater Switch

A week ago, after having grid heater issues , and determining the ecm wasn't delivering the signal to activate the new or old grid heater solenoids, I wired up a manual switch. At the time, -20 upstate NY winter days, this was the simpliest option. The switch worked, activates the solenoids, but right after the engine starts, I'm popping the inline fuses. Using two 4awg runs off the battery, to 2 inline buss fuses, to the solenoids, with a 100A fuse, first try the grid heater activated and worked, but 3 seconds after the engine started, it blew the fuse. Upgraded to a 120a fuse today, and did the same thing. Without the truck running, it seems to function fine.

What's my problem here? Is it too much current while charging/running? Would replacing the 4awg to some smaller runs help ?

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Old 01-10-2018, 12:01 PM   #2
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What kind of switch are you using and where do you have it wired in?

It should be a momentary switch wired to activate the relays, not to supply power to the grids. Shouldn't be anywhere near 100amps.
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Old 01-11-2018, 06:49 AM   #3
GAmes

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Did you totally disconnect the stock leads, then supply new ground and power leads? As I told you before, the PCM provides a ground signal. The other two leads (one to each relay) are always hot.
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Old 01-11-2018, 08:30 AM   #4
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Sounds like the grid is shorting and maybe the engine running is enough vibration to do it.
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Old 01-11-2018, 12:00 PM   #5
4x4dually
 
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Quote:
Originally Posted by CorneliusRox View Post
Sounds like the grid is shorting and maybe the engine running is enough vibration to do it.
Exactly what I was going to post. If you are blowing 100 and 120 A fuses, stop and find the short. That is going to burn your truck to the ground.
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Old 01-11-2018, 12:02 PM   #6
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Quote:
Originally Posted by 4x4dually View Post
Exactly what I was going to post. If you are blowing 100 and 120 A fuses, stop and find the short. That is going to burn your truck to the ground.
Nah just keep upping the fuse sizes. It'll be ok.
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Old 01-11-2018, 12:02 PM   #7
4x4dually
 
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Nah just keep upping the fuse sizes. It'll be ok.
This ain't cumminGs forum.
 
Old 01-11-2018, 12:59 PM   #8
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Be a man, no fuses, solid wire!

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Old 01-11-2018, 01:01 PM   #9
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Be a man, no fuses, solid wire!
Straight 4 AWG is rated to 90 deg C temp rise at 95 amps. Remove the fuse and it WILL fuse.
 
Old 01-12-2018, 07:41 AM   #10
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This ain't cumminGs forum.
fb or the other web page lololol
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