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Old 02-12-2012, 08:09 PM   #11
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And how does backfeeding 12 to 14 volts into your trucks charging system from the trailer, especially when the alternator is doing the same thing in pretty much the same spot, cook your computer and DIC?
The diode in a relay is for transient voltage suppression, when you drop power to a relay a voltage spike ensues. Voltage spikes of up to 100v are common, it can and will kill electronics.
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Old 02-12-2012, 11:17 PM   #12
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The diode in a relay is for transient voltage suppression, when you drop power to a relay a voltage spike ensues. Voltage spikes of up to 100v are common, it can and will kill electronics.
We don't feed trolls around here...
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Old 02-12-2012, 11:46 PM   #13
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ONTHEFENCE is correct, and I have the electronics degree to prove it. When the voltage collapses on a coil, (as in a relay coil), a reverse voltage spike is generated, and can damage electronics. A diode place across the coil, in the proper orientation, will short this spike out, and no damage will occur.

Now as to why the dealer installed relay caused damage, we have no proof, just the dealer's word. We also don't know what 12 volt wire he hooked the relay to. I can only assume it was one that was tied to the computer somewhere. Dealer should have corrected and cut the poster a break, but that is his battle to fight, not mine. As for sloppy install, (relay hanging), again his battle to fight. And yes, the Ford trucks have had this as a factory option quite a while, as long as you got the towing package, not sure if Chevy or Dodge has caught up or when. Don't evetyon chime in on the last statement please, let's stay on topic.
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Old 02-13-2012, 06:38 AM   #14
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We don't feed trolls around here...
Wow, now thats a warm welcome.
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Old 02-13-2012, 08:24 AM   #15
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We don't feed trolls around here...
I don't understand this comment or how it applies to this thread.
Please explain.

Also, I also don't understand why the OP's original dealer installed a relay to disconnect the camper when the truck's key is turned off on his Chevy truck.

The charging circuit line is already relay protected (in the engine compartment fuse box) through the ignition circuit. In my 2008 GMC Sierra, the ignition key must be in ON/RUN to get juice on the charging line to the socket.
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Old 02-13-2012, 01:48 PM   #16
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I don't understand this comment or how it applies to this thread.
Please explain.
I jumped the gun and made some assumption that may have been in correct. I do apologize.

On a side note, having spent the last 18 years as an Electronic Technician and Technical Manager repairing and maintaining video games, as well as several years as an installer doing car stereos and alarms, I might not have the theory down like you guys, but I have plenty of experience on the practical side dealing with these issues.

I question how the noise of a relay on the power side took out his logic boards. There is a pretty big coil in the starter solenoid, ton of coils in the relays for the fans, light, foglights, AC. Not to mention how dirty the power coming from that alternator is. Yes, you can see the voltage pike on an o-scope, but put that relay into the real working world, right next to the battery (and all of its capacitance) and let theorize about how that killed his BCM or PCM.
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