Bridging a four channel with speaker level inputs...

[86svo 10+ year member]

Ok, in my 04 Ranger I am retaining the stock deck since I'm just doing a budget system and I have ran all my wires and the front components sound great, the only problem is I'm not getting a signal when I try to bridge 3&4. This is an Alpine F-300 so it is a 2,3,4 amp and I'm using it as a 3 channel.

The way I have the speaker level inputs wired are green and white to front left side positive, white/black and green/black to front left side negative. Then I have Grey and violet to front right side positive, grey/black and violet/black to front right side negative.

Now I can get a complete signal if I hook the sub up to a single channel, but when I try to get the bridge....nothing. Did I not wire up the input levels correctly? It seems as though it should be accurate, but not too sure? Anyhow, any help would be great, thanks!

Jason

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[86svo 10+ year member]

anyone have an idea?