1990 Chevy Suburban half of everything works

SCOTTDUDEK75

MEMBER
1990 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
244,000 MILES

I lost power at the fuse block for my speedo power windows and heat ac blower all at once if I backfeed the power thru the fuse block everything works ok Is there a fusible link I am missing in the engine compartment?

Friday, April 3rd, 2009 AT 4:22 PM

5 Replies

JAMES W.

MECHANIC
2,395 POSTS

There should be 2 maybe 3 red fusable links coming off the terminal on the starter where the main battery cable attaches. Check these for voltage. Sounds like you may have blown one of them.

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Saturday, April 4th, 2009 AT 1:18 AM

SCOTTDUDEK75

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2 POSTS

Ok I think I located all of them but is there an easy way to test em without piercing the insulation on the wire I live in michigan salt loves copper it looks like they are plastic couplers joining wire to the link but dont see how they come apart

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Saturday, April 4th, 2009 AT 5:36 PM

JAMES W.

MECHANIC
2,395 POSTS

The fuseablr links won't come apart. The best way I've found to test them is with an ordinary "stick pin". They leave a very small hole and can easiy be civered with tape. Just be careful you don't short it to ground.

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Saturday, April 4th, 2009 AT 6:24 PM

SCOTTDUDEK75

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2 POSTS

There must be some sort of relay the fusible links all test good at least he ones I can find everything that is out on the fuse block is ignition on items where is this relay at and how do I switch it out?

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Sunday, April 5th, 2009 AT 4:46 PM

JAMES W.

MECHANIC
2,395 POSTS

OK, Ihave looked at the diagrams for your "power distribution", what few I have, and everything you are missing power to comes from a single fusible link from the starter. At this point, we need to look at the back if the fuse block and check for any "opens" in the links of the block. Check this out and let me know.