somethin wrong wit acc wire

[Audio4ever 10+ year member]

on a 93 grand am acc wire has no power on radio harness or fuse box(radio or fans work) how can i fix it???

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[keep_hope_alive Premium Member]

some fuses are downstream of other fuses. start by checking more fuses. instead of checking all of them, you could pick up a Haynes manual so you have schematics.

if your fuse box is damaged and you need another ignition wire. you can make your own by taking a wire to the battery (fused at the battery), then using a relay to create your switched ignition. tap a functioning ignition source somewhere in the fuse box and use that to power the coil. the coil uses so little current, it won't hurt the fuse you tap. you can use one relay for each desired ignition source, or one relay for both. if you reduce wire size, add another fuse for the smaller wire.

 

[carlosg_313 10+ year member]

check the fusebox if the fuse is blown. had the same problem and you got to find that fuse that is fusing the 12 acc. dont know the car, but its a start. took me 3 days to find a small lil fuse that was right under my steering wheel. lol

 

[keep_hope_alive Premium Member]

i've used these Bussman fuse blocks before. Autoparts stores sell them.

Bussmann 15600-06-20 Fuse Block ASSY.

allows you to have one input and individually fused outputs. the relay could feed this then you have multiple fused outputs. granted, the relay can usually only handle 30A or 40A and the wire at the battery would need to be fused for the relay contact rating. 10awg for 30A and 8awg for 40A.

 

[Audio4ever 10+ year member]

its jus all my accessories that dnt work

 

[keep_hope_alive Premium Member]

most likely an upstream fuse is popped. check the engine bay fuse box as well.

 

[Imtjnotu 5,000+ posts]

take one off of somewhere else.....

 

[Audio4ever 10+ year member]

fuse is good jus no power flowin to any acc wires

 

[keep_hope_alive Premium Member]

how many fuses have you checked? and by checked, i mean use a DMM and measure voltage on both metal tabs (while inserted in fuse box) with the car running. both in the cabin and engine bay. that's the fastest way to trace voltage.

you need to find out where the ignition voltage is being lost. first step is always with a DMM and probing voltage at every fuse, then noting where those fuses are on the schematic. if i were to fix your problem, i would start with a schematic and a DMM.

fuse boxes can develop loose connections or even melt if load is added to them.