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Anybody have an answer to this electrical problem?
All was working well, until the following occurred.
The temperature gauge is not working, and both turn signals work but both turn signal lights remain lit. The 5th gear light remains on, and the high beam light comes on when the lights are on low beam. When I switch to high beam, the light goes off.
 

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Most likely your "Bulb Failure sensor under the dash. Try to find someone with a known good one to switch and confirm or go on www.davebarton.com for research. Also these pre '88' 240s had bad insulation around the engine wiring harness that broke down with engine heat. watch for broken wiring insulation along engine firewall. Tho' your problem being turn signal related is more likely "bulb failure sensor".
 
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