Deck No Longer Works After Boosting Truck

[Thoriden]

So Long story short, Battery died on me, boosted truck but it was dark and i accidently crossed the cables on my own truck for about 2 seconds, wasn't long enough to melt them, and nothing else seems to have gotten fried.

But my deck no longer turns on, at all....

I've checked the fuse it's good, i've checked for a second fuse behind the deck don't see one... And apparently i have no fuse on my inline....

So anyone have any other ideas? Or is it likely that because there's no inline fuse that my Deck is shot.

Deck is an Alpine CDE-9874l

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[Ignatowski 5,000+ posts]

sounds like you answered your own question........you fried your sh it

 

[VWBobby 10+ year member]

You probably fried the deck. I had a friend blow an alternator doing just what you did (reversed polarity).

To check, make sure you're getting 12V at your positive (red) wire, proper ground and 12V going to the "turn on" lead....usually yellow or red with yellow stripe. If its getting power and no turn on = blown. You could pop the top and try to find an internal fuse, some are mounted on the board itself.

 

[pickup1 5,000+ posts]

Sometimes there are fuses under the hood..

 

[04silverz 10+ year member]

check all fuses, and not just visuallly. had something similar happen to me and thought i fried my sh it. originally only visually looked at my truck fuses and they were fine so i left them alone. I later on ended up actually pulling them and checking them again. when i re inserted the fuse everything was fine and started working.

so in other words, check under your hood for fuses, in your cab for fuses and make sure to actually pull them and replace if necessary or hopefuly just reseat them like i did.

 

[Thoriden]

Ok so changed all fuses just to be sure, including the inline power fuse, which i finally found and it was also intact, my question is how do i fry a radio because of this without even blowing a single fuse anywhere..... Also if it makes any difference my amp doesnt turn on either, i'm not sure if the deck has to be on for the amp to turn on or not... I don't know the first thing about this stuff really.

 

[cyn 10+ year member]

check to see if the pico fuse is still intact.. its a very very small fuse on the board itself

 

[Thoriden]

check to see if the pico fuse is still intact.. its a very very small fuse on the board itself

Just checked, there is no very very small fuse on the board, only the normal sized ones.

This is in a 88 dodge ram 100 btw, if that influences possibilities at all.

 

[KyleBechtold 5,000+ posts]

all terrible answers.. how are you going to say his deck is blown with testing it.. OP take the deck out and connect it directly to the battery to test it.. for the ACC just connect it to the positive.. if it turns on then you have a wiring issue some where and there is either a fuse blown or melted wire

 

[cyn 10+ year member]

Just checked, there is no very very small fuse on the board, only the normal sized ones.
This is in a 88 dodge ram 100 btw, if that influences possibilities at all.

pico fuse looks like this btw

 

[goingdef 10+ year member]

fuses don't always blow when your reverse the polarity, but like ^^^ he said pull it from the vehicle to test it your going to have to anyways if it's blown up.

 

[Thoriden]

Just took a picture of my fuses, i definitely don't see one of those.

Also taking the deck out requires completely disassembling my dash, so i'd only like to do that as a last resort.

 

[keep_hope_alive Premium Member]

The red 10A fuse in the pic is the radio fuse. To test a fuse you use a DMM and measure VDC on both metal tabs, with the fuse inserted. That is what those tabs are for. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

If you measure 12V on both sides, the fuse is good. If you measure 12V on one side only, the fuse is bad. If you don't measure 12V on either side, the issue is up-stream.

The head unit will likely have a fuse on it as well. You need to remove the head unit to access it.

If you measure 12VDC on both the red ignition and yellow battery wires at the head unit, referencing the black ground wire: the HU fuse is blown or the deck is damaged.

A pico fuse is on the signal path, not the power supply.

 

[keep_hope_alive Premium Member]

In this pic you can see the radio fuse to the left of the harness jack. Not in-line with the wire, check/replace this fuse.