#8 fuse help

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#8 fuse help

Postby Wmamula04 » Wed Apr 14, 2021 6:50 pm

I’m not getting any power to my #8 fuse. It’s a 91 V6 trooper. Any ideas on why and how I can fix it?
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Re: #8 fuse help

Postby Buster28 » Thu Apr 15, 2021 5:44 am

What electrical component is protected by fuse #8 ?
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Re: #8 fuse help

Postby Wmamula04 » Thu Apr 15, 2021 10:02 am

Buster28 wrote:What electrical component is protected by fuse #8 ?

It’s the a/c comp relay so I’m pretty sure most of the a/c system
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Re: #8 fuse help

Postby Buster28 » Thu Apr 15, 2021 10:22 am

This is all I have on the AC system, may be of some help.
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Re: #8 fuse help

Postby QuantumRift » Mon Apr 26, 2021 7:59 pm

Fuse #8, according to the schems I have, has a blue/white wire feeding it off the blower relay. If the blower relay isn't engaging, you'll never get power to that fuse. A fusbile link A feeds that circuit, that is it feeds the HOT Side of the blower relay. Power to OPERATE that relay comes from a 10amp fuse #11. Power comes off that hot from the ignition switch (on, etc).

My guess is that the blower relay is bad. Pull it and tap in on the fender well or whatever and inspect the tabs on it and the socket it goes into for good connection, no corrosion, etc. If you have another fuse of the same type, just swap it out and see if your blower motor works or you have power to the fuse (and on the other side of the fuse). If still no power, check on both sides of FUSIBLE LINK A.

I am suggesting this based on you saying you have no power at fuse 8, and not that it keeps blowing.

Happy hunting.



(not relative to the conversation, however).
Below the fuse is a green/black wire that feeds:

AC/heater control assembly
AC compressor cut-out relay #1
another unnamed connection on the control assembly.

when the ac compressor cut-out relay is engaged, then it feeds power to the A/C compressor relay. The output of THAT relay feeds an A/C dual pressure switch, fast idle solenoid, etc etc.
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Re: #8 fuse help

Postby Wmamula04 » Mon May 03, 2021 10:38 am

So no power was getting to the relay period. So for now I made a jumper cable and jumped the power from the power window relay to a/c relay. I tried wiring it so that it would get power again with the relay plugged in but the relay would just buzz and not do anything. I’m pretty sure it’s because it’s getting too much power on one side of the relay, it’s really confusing to explain. All the fusible links are just fine as well.
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Re: #8 fuse help

Postby QuantumRift » Sun May 16, 2021 10:04 pm

Power comes down to that via the ignition switch position. Check your ignition that's the only other thing in the path that could interrupt 12V going to that circuit and fuse.
"If Opportunity knocks and he's not at home, Opportunity waits."
"Find out what it is in life that you don't do well, then don't do that thing."

1990 Isuzu LS SpaceCab 4x4 (Japanese-built, September 1989)
226,000 miles original, unrebuilt engine.
K&N Air Filter
2.6 L 4ZE1 engine, 5-spd manual
Monroe Sensa-track Load Adjusting Shocks (rear)
Monroe OE Spectrum Shocks (front)
MagnaFlow Muffler & Cat Converter
Akebono ProACT Ultra-Premium Ceramic Brake Pads (front)
Wagner Thermoquiet Ceramic Brake Pads (rear)
Owned since 15 miles. Bought new Honolulu, HI in Oct '89.
Original sticker price: $15,000.
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