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#12420192 - 09/09/17 01:20 PM Mercury 125 temp sender location
Knotacull Offline
Outdoorsman

Registered: 01/23/11
Posts: 23
Loc: Fort Worth Texas
I have a 2003 Merc 125 with constant console alarm with key turned on before starting. I believe the temp sender is bad and can be TS by unplugging wire but I can not locate the senser or wire. I have the shop manual but the picture sucks. Could someone post or text a picture showing location please. 817-937-6510
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#12420726 - 09/09/17 09:36 PM Re: Mercury 125 temp sender location [Re: Knotacull]
scruboak Online   content
Pro Angler

Registered: 03/11/03
Posts: 909
Loc: Cisco,tx
Best I can find from searches is sensor has a brown wire with blue line all pics appear to be top port side .

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#12421146 - 09/10/17 12:16 PM Re: Mercury 125 temp sender location [Re: Knotacull]
OPTI Offline
Extreme Angler

Registered: 06/23/04
Posts: 1420
Loc: Benbrook Tex
Its not going to be your temp more than likely it going to be a bad float in the oil tank and float is not repairable complete tank will have to be replaced. But the answer to your question is the temp sender is on the back of the motor and it is a tan with blue tracer wire....OPTI

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#12421261 - 09/10/17 02:17 PM Re: Mercury 125 temp sender location [Re: Knotacull]
Knotacull Offline
Outdoorsman

Registered: 01/23/11
Posts: 23
Loc: Fort Worth Texas
Thanks for the reply. I changed the oil tank last year so thought it was likely engine temp but OPTI got it, another oil tank sensor failure. Thank you both. I also found and checked temp sender its on the aft of the power head on my motor 2003 Merc 125 4 cylinder 2 stroke sn 0t685682
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Many men go fishing all of their lives without knowing that it is not fish they are after. ~Henry David Thoreau

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#12422718 - 09/11/17 02:34 PM Re: Mercury 125 temp sender location [Re: Knotacull]
txmasterpo Offline
TFF Team Angler

Registered: 11/10/12
Posts: 4999
Loc: Emory
You should remove all of that oil injection, tank, etc....mix in the tank....did mine years ago along with performance reeds and carb job....runs like a scalded [censored] ape
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