07 Denali/Fuses

[pun2310]

I have a 07gmc Yukon Denali that has multiple fuses not working but fuses are not blown. Does anyone have an idea what the problem can be. Please help

 

[j91z28d1]

you'd have to look up your model but I've noticed on the wiring diagrams that a lot of fuses are after relays. never seen setups like that, normally the fuse is before the relay, so you have power on the fuse unless it's blown. here you have it after a lot of times, so like say a turn signal fuse, normally I expect to see power any time it's running on that fuse. but on my truck fuse only has power when the bulb is on. put a test light on the fuse and it blinks with the bulb.

if you have fuses you think should have power, check the relay that before that fuse.

 

[Fless]

Might be good to understand which fuses are not being powered. Fuse #s, circuit descriptions?

 

[pun2310]

you'd have to look up your model but I've noticed on the wiring diagrams that a lot of fuses are after relays. never seen setups like that, normally the fuse is before the relay, so you have power on the fuse unless it's blown. here you have it after a lot of times, so like say a turn signal fuse, normally I expect to see power any time it's running on that fuse. but on my truck fuse only has power when the bulb is on. put a test light on the fuse and it blinks with the bulb.

if you have fuses you think should have power, check the relay that before that fuse.

Thank you for the info much appreciated. I tested relays and they all work so I took it dealer for a diagnostic and they are telling me it’s the wire harness

 

[j91z28d1]

Thank you for the info much appreciated. I tested relays and they all work so I took it dealer for a diagnostic and they are telling me it’s the wire harness

is something on your truck not working that lead you to looking for power? or were you like randomly testing fuses?

 

[pun2310]

I checked fuses relays clean all grounds and change spark plugs with boots and still the same. It has a delay crack start and loss of power. If I were to punch it it bogs and nasty punch

 

[Fless]

Sounds like a fuel delivery issue, but that's just a WAG based on the skeletal info. Would like to see more info like fuel pressure and fuel trims.

Once you get your electrical problem fixed it would be good to see how it runs then. What wiring harness is needed?

 

[j91z28d1]

Sounds like a fuel delivery issue, but that's just a WAG based on the skeletal info. Would like to see more info like fuel pressure and fuel trims.

Once you get your electrical problem fixed it would be good to see how it runs then. What wiring harness is needed?

yeah, we need more info, back story and stuff.