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Electrical Gremlins in the Blower Circuit?

Posted: Sat Nov 04, 2017 11:54 pm
by 5280_GTS
Was on a drive the other day and on the way home, my gauges started going crazy.

The tach dropped to 300 rpm, the brake light came on in the dash, the oil pressure gauge is pinned past the H, the Temp Gauge wont go past 1/4 of the gauge and the Blower motor turned itself off. Once I got home I checked all the fuses and noticed that the 7.5A Gauge Fuse was blown so I replaced it and started the car. The tach seemed fixed, but it wont rev past 3000rpm, even though the engine will. The brake light on the dash stays on and wont go away but is very faint. The Blower doesnt turn on at any of the speeds and when switched on, kills the Head Lights.

I checked all the fuses and they were fine.
I checked the Connector at the Temp Sensor and its fine.
I checked the Head Light Relay, Heater Relay, Blower Breaker and Blower Motor and they were good too.
I checked the Wiring from the E-brake Switch to the Instrument Cluster and they were fine and I have plenty of Brake Fluid.
The Head Lights work fine by themselves, but if you move the blower switch to any speed, they turn off.

Been having a real hard time trying to figure this one out and have tried almost everything. It's like all the most difficult, pain in the ass, intermittent problems always seem to find me and at the worst times(perhaps that's just an 86 thing?). Winter is Coming here in the Rockies and I really need that blower working any help would be greatly appreciated.

Re: Electrical Gremlins in the Blower Circuit?

Posted: Sun Nov 05, 2017 12:52 am
by totta crolla
There will be some trial and error fixing this problem. First check all of the grounding points and if they are ok you might be able to isolate the problem to a particular circuit by removing fuses. Remove a circuit fuse, create problem by switching on blower and if fault remains replace fuse and move on to another circuit. Sometimes a dying alternator can show similar symptoms but don't get too hung up on
that.