1989 240dl instrument wiring help needed

  #1  
Old 12-09-2018, 08:10 AM
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Default 1989 240dl instrument wiring help needed

Hi guys, new member and recent volvo 240 dl 5 speed owner here. Just starting with some mods.
I was in the process of wiring in a factory small clock and volt gauge
and accidentally touched the ground wire from the clock wiring to the hot clock wire.
nothing was connected at this point, I just had the clock wiring exposed through the dash. (Hot , ground and green dimmer light wire)
Dash lights are now extremely dim and will fade to black when turning the dimmer ****. The left and right turn signal dash indicator lights are now also on faintly when the lights are turned on?
Not sure what may have shorted here? I do not have a wiring diagram. Any insight would be greatly appreciated.
Thanks! Dave


 

Last edited by faceache; 12-09-2018 at 12:47 PM.
  #2  
Old 12-09-2018, 02:49 PM
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never work on the wiring of anything thats got power applied... standard procedure on cars is to disconnect the - terminal of the battery before doing anythng electrical.

as far as what you fried? could have melted part of a trace of either the power or ground circuit. might have fried the dimmer pot... hard to see how you got the turn signals, tho, unless its a ground trace that smoked.... tyhere's a 3pin voltage regulator on the instrument panel, but AFAIK its only used by the gas and coolant gauge to stabilize them.




 
  #3  
Old 12-09-2018, 03:08 PM
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Thank's for the diagram Pierce! yeah. the constant hot wire for the clock is protected by a sleeve, figured I'd get away with it. (not)
I still have power to the clock wire and the dimmer light still has power when lights turned on. I'll pull the cluster and look for damage.
cheers Dave
 
  #4  
Old 12-09-2018, 04:22 PM
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silly question, is fuse 8 intact ?

one of the best things you can do with a 240 is replace all those tin fuses with the updated copper/brass ceramic fuses made by Flosser. you can get packs of these on ebay or amazon or various Volvo and Mercedes parts suppliers with sufficient white, red, blue fuses to do a whole 240 twice over. Older Mercedes models use these fuses too. as you remove each fuse, take a pink pencil eraser and clean the spring fingers where the fuse goes in... probably a good idea to remove the battery - cable when doing this as there's a lot of opportunities to short things.

fyi each fuse, the left finger is the power source/input, and the right finger is the load output
 
  #5  
Old 12-09-2018, 05:14 PM
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Thank's Pierce, good info on the fuses! fuse 8 still good.. You obviously know your Volvo's.. what a great resource! I'm Just getting into the Volvo 240 and its mods..
Dave
 
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