Tech: Every possible dash switch for GMT400 trucks

[Supercharged111]

We can take it a step further: a transistor is also like a relay, but can only handle enough current to fire off a relay coil, so it could be the ground for 85/86. My only experience with this was with an SDS standalone engine management system. In order to drive the ignition system I wanted to, I had to solder in 2 transistors. They each had 3 pins. The computer would apply power to the first pin which meant current could then flow across the other 2. This closed the circuit for the ground on a relay coil, and finally the relay itself (30/87/87a) could carry the real juice.

 

[SUBURBAN5]

So relays just depend what your trying to power? Not everything electrical needs one? In my case I only plan on powering lights which all have came with relays. If I installed an aux fan I believe I need a relay?.

 

[Supercharged111]

So relays just depend what your trying to power? Not everything electrical needs one? In my case I only plan on powering lights which all have came with relays. If I installed an aux fan I believe I need a relay?.

The switch will tell you what it's rated for, but I prefer to use relays when I can.

 

[SUBURBAN5]

The switch will tell you what it's rated for, but I prefer to use relays when I can.

On that note I'm using a stock switch. Specifically the one for cargo light. Was it suppose to light up or no?

 

[Supercharged111]

On that note I'm using a stock switch. Specifically the one for cargo light. Was it suppose to light up or no?

The switch itself? Mine doesn't, not sure if it's supposed to though.

 

[SUBURBAN5]

The switch itself? Mine doesn't, not sure if it's supposed to though.

Ok just wondering. I didnt know if the circuit from cluster was for light and ground is just ground for the switch .

 

[Frank Enstein]

If it has more than 2 connectors on it it must be lighted. You would only need 2 to turn on the cargo lamp.

 

[SUBURBAN5]

If it has more than 2 connectors on it it must be lighted. You would only need 2 to turn on the cargo lamp.

I guess it burnt out then. I tried testing it. No luck

 

[east302]

On that note I'm using a stock switch. Specifically the one for cargo light. Was it suppose to light up or no?

They do. It’s a little bulb like the radio lights with the leads soldered in.


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[SUBURBAN5]

Well next time I go to the junk yard I'll try to jack one so I can try to take it apart