 Need help on wiring, Dimmer wire from new radio...where to splice |
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| drdriddle |
 Sep 3 2024, 03:16 PM
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#1
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Newbie  Group: Members Posts: 29 Joined: 16-March 23 From: montana Member No.: 27,230 Region Association: None  |
I am running an alpine radio that has a dimmer function wire. It hooks somewhere, I assume, into the headlight switch. This should allow the radio illumination to match the dash light illumination when the headlight switch is pulled on. I know the headlight switch has a rheostat that controls the light output for the dash but the switch itself has multiple poles off of it and i have no idea if one of them is responsible for what im looking for.
Anyone have any ideas? the wire diagrams i have in the hayes manual are very small and don't really help please and thank you |
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| 87m491 |
Sep 3 2024, 03:25 PM
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#2
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Member Group: Members Posts: 327 Joined: 29-July 12 From: Portland, the original! Member No.: 14,731 Region Association: North East States 
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Grab your DVM and ground the negative test lead, then put the positive lead on each of the power out leads of the switch. (not the bigger power lead into the switch) See which output lead varies voltage when using the dimming function of the switch. That's likely the lead you want to tap into. Slide the radio lead into the connector and double check radio illumination function.
QUOTE(drdriddle @ Sep 3 2024, 01:16 PM)  I am running an alpine radio that has a dimmer function wire. It hooks somewhere, I assume, into the headlight switch. This should allow the radio illumination to match the dash light illumination when the headlight switch is pulled on. I know the headlight switch has a rheostat that controls the light output for the dash but the switch itself has multiple poles off of it and i have no idea if one of them is responsible for what im looking for. Anyone have any ideas? the wire diagrams i have in the hayes manual are very small and don't really help please and thank you |
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| davep |
Sep 3 2024, 04:45 PM
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#3
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914 Historian Group: Benefactors Posts: 5,262 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
Well this is pretty easy, at the rear of the switch are two terminals for the rheostat (right next to the terminals). One of those terminals is the input, and the other is the output. Get a piggyback splitter, and put it on the output, then the original wire on the splitter, and the new wire on the splitter.
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| drdriddle |
Sep 3 2024, 04:54 PM
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#4
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Newbie Group: Members Posts: 29 Joined: 16-March 23 From: montana Member No.: 27,230 Region Association: None |
QUOTE(davep @ Sep 3 2024, 04:45 PM) Well this is pretty easy, at the rear of the switch are two terminals for the rheostat (right next to the terminals). One of those terminals is the input, and the other is the output. Get a piggyback splitter, and put it on the output, then the original wire on the splitter, and the new wire on the splitter. Thank you guys. I seriously wish I would’ve asked this question four days ago before I buttoned up the dash. I was tucking the last of the wires away yesterday and realized I had put that last wire aside for ‘later’. Later was last Friday… |
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| Spoke |
Sep 3 2024, 05:27 PM
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#5
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Jerry Group: Members Posts: 7,158 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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@drdriddle
The dimming wire from the headlight switch goes to every illumination bulb in the instruments of the dash. You should be able to grab one of those rather than having to mess with the headlight switch. |
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| JeffBowlsby |
Sep 3 2024, 06:06 PM
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#6
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 8,907 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Yes, connect to any black/blue stripe wire in the dash or center console, it’s all the same circuit.
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| Spoke |
Sep 3 2024, 06:07 PM
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#7
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Jerry Group: Members Posts: 7,158 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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You can use one of these piggyback spade connectors to add the wire to any illumination bulb spade to connect the dimming wire from the stereo. $0.80 at Digikey.
Piggyback Quick Disconnect Spade at Digikey |
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