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No power to mini fuses?

 
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farmer41
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PostPosted: Wed Jun 22, 2011 9:30 pm    Post subject:  No power to mini fuses? Reply with quote

Go a 2000 impala and have a problem,

The under the hood lower fuse panel I have no power to all mini fuses but the 25 amp fuses for the fans.
All the 60 amp and relays work in the panel and all the relays and fuses in the upper panel work but found the drivers side PCM crank fuse has no power either.
Try them with the ignition both on and off but nothing?

Any help?
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bbengineer
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PostPosted: Wed Jun 22, 2011 9:41 pm    Post subject:   Reply with quote

Underhood Fuse #2 (60 Amp) in the bottom outside fuse box is directly connected to the battery, and feeds the Ign Relay (in the bottom outside fuse box) which feeds most of the mini fuses in the bottom outside fuse box

Double check that both sides of the Uhood #s 60A fuse have power (and are making good contact with the contacts in the fuse box) and make sure the Ign Relay is working and actually passing current across it's contacts...

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farmer41
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PostPosted: Wed Jun 22, 2011 9:59 pm    Post subject:   Reply with quote

Thanks for the help!
Tried the 60 amp fuse and have power on both sides..
Pulled the relay and tried a new one... no help

Tested the relay contacts and have power on the top right contact only

an idea?
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bbengineer
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PostPosted: Wed Jun 22, 2011 10:02 pm    Post subject:   Reply with quote

I don't know what the "top right contact" is, but I will assume it's the pin 30 equivalent on a Bosch Relay

In the left hand instrument panel fuse box, check the 10A ABS/PCM fuse... it also drives the Ign relay

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farmer41
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PostPosted: Wed Jun 22, 2011 10:09 pm    Post subject:   Reply with quote

tried the ABS/PCM 10 amp fuse and it has power both sides of fuse but the PCM (CRANK) fuse has no power on either side?
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PostPosted: Wed Jun 22, 2011 10:12 pm    Post subject:   Reply with quote

You won't have power to the crank fuse if none of the other fuses have power...

If you only have power on one terminal of the IGN Relay with the ignition on, then you either have a bad Underhood #2 60A Maxi Fuse or a bad 10A ABS/PCM fuse (even though they show good) or a wiring problem between those fuses and the relay

You said only one of the IGN Relay terminals has power, what color is the wire going to that terminal?

EDIT: Do you have power to any of the terminals on the crank relay? If so, what is the color of wire going to that terminal?

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farmer41
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PostPosted: Wed Jun 22, 2011 10:28 pm    Post subject:   Reply with quote

testing the ignition relay contacts(lower panel), there are large green (no power) larger red (no power)
small black and small pink which one has power.

I believe the larger red wire should have power but don't no where it leads to
and the large green wire is the power output to the mini fuses.

Any idea where the large red wire leads?
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PostPosted: Wed Jun 22, 2011 10:33 pm    Post subject:   Reply with quote

The large red wire goes directly to the 60Amp Underhood Fuse #2...

I would remove that maxifuse and check continuity across it... and then reseat it

The pink wire goes to the 10A ABS/PCM Fuse

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farmer41
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PostPosted: Wed Jun 22, 2011 10:59 pm    Post subject:   Reply with quote

thanks for the help!

Tested the wires, have power on large red from the 60 amp fuse which I think through the relay powers the green large wire to the mini fuses.

As you said, the pink wire has no power which should from the ABS/PCM 10 amp fuse on the drivers side and the 10 amp ABS/PCM fuse works fine..

Can I run a new pink wire from the outlet from the ABS/PCM fuse output to the ignition relay to fix the problem( current one is fried?)

Thanks!!
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PostPosted: Wed Jun 22, 2011 11:03 pm    Post subject:   Reply with quote

The ABS/PCM fuse drives many circuits... you need to figure out what's actually going on or replace alot of wiring...

Pull that 10A fuse and make sure it is actually good (has continuity between the blades) and is making good contact..

Check for continuity between the ABS/PCM fuse contact and the IGN Relay pink wire...

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