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Old 06-25-2016, 09:49 PM   #1
soulpedal
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70 cluster swap to 67 harness?

Hi I'm new here and have a question.. What am I missing here?? Can you swap a 70 cluster into a 67 c10 with basic cluster? I'm not getting cluster lights, no dimming, right side signal stays lit when key turned. Headlights work, gas gauge does not work. My cluster light and gas gauge worked before on the old cluster. Do I need to swap a later headlight switch?? I cleaned the contacts on the harness end and cluster, checked bulbs. Unsure about fuse at panel, didnt look broken.
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Old 06-25-2016, 09:58 PM   #2
GR8-68
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Re: 70 cluster swap to 67 harness?

I believe you have to have the correct harness to be able to switch the clusters, it is a matter of gauges verses idiot lights. They do not interchange
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Old 06-25-2016, 10:07 PM   #3
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Re: 70 cluster swap to 67 harness?

Can I splice my existing harness or do I need the 70? If I need the 70, how far back should I cut it? Anyone have a wiring diagram for this type of swap? I would think if you isolate things it could be done.
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Old 06-25-2016, 10:17 PM   #4
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Re: 70 cluster swap to 67 harness?

GMC Paul's has a tips section that explains the swap
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Old 06-25-2016, 10:25 PM   #5
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Re: 70 cluster swap to 67 harness?

Start here and come back with any questions.

http://67-72chevytrucks.com/vboard/s...d.php?t=588853
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Old 06-25-2016, 10:40 PM   #6
soulpedal
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Re: 70 cluster swap to 67 harness?

Says for a 69, yet I see the pin connection for 67. So that's a good starting point, thank you! Pretty much I need to identify the wires on my harness in the 67, going to take me a minute to digest, looking for fuel wire, then look for 70 diagram. Start 1 at a time.
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Old 06-25-2016, 10:42 PM   #7
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Re: 70 cluster swap to 67 harness?

What about the headlight switch?
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Old 06-26-2016, 11:55 AM   #8
VetteVet
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Re: 70 cluster swap to 67 harness?

Quote:
Originally Posted by soulpedal View Post
Says for a 69, yet I see the pin connection for 67. So that's a good starting point, thank you! Pretty much I need to identify the wires on my harness in the 67, going to take me a minute to digest, looking for fuel wire, then look for 70 diagram. Start 1 at a time.
The 67 and 69 are identical. The link to the thread shows the wire locations on the cluster plug and the differences between the two cluster but for the viewers I will post them here.

The idiot light connector wiring and location.

Name:  idiot light connector diagram.jpg
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The gauge cluster plug----

Name:  gauge connector diagram.jpg
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another view of the cluster plug wiring for the gauges.

Name:  cluster connector with gauges.jpg
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Notice the blue wire on 1 is removed and replaced by an 18 gauge wire from the alternator battery junction for the ammeter. the no. 5 green wire is moved to the no. 6 pin for the temperature gauge and the sender must be changed to a gauge sender. ( the light sender is different)

12 is moved to 8 for the panel lights and the 12 is replaced by another 18 gauge wire from the battery terminal on the right fender, where the fusible link, and the battery charge wire, to the alternator junction connects.
These two 1 and 12 wires for the ammeter have 4 aamp fuses in line to protect the ammeter gauge.

Here is a diagram with these wires and fuses shown and how they are connected. The fuses are circled in red and the battery charge wire is labeled as the SHUNT in the diagram.

Name:  V8-engine-web%20amp%20fuse.jpg
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This is the cluster wiring after the change to gauges.

Name:  Dash  Layout Final.jpg
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Quote:
Originally Posted by soulpedal View Post
What about the headlight switch?
The headlight switch has no bearing on the cluster except that it powers the instrument lights fuse at the fuse panel which are then changed from 12 on the light cluster to 8 on the dash cluster. (gray wires).
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Old 06-26-2016, 03:07 PM   #9
soulpedal
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Re: 70 cluster swap to 67 harness?

What is the trick to getting the contacts to release from the plastic holder? I pushed down on the tab and pulled but stays.
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Old 06-26-2016, 03:15 PM   #10
soulpedal
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Re: 70 cluster swap to 67 harness?

Going to start with 12 to 8, then fuel. Think I've been looking at this all wrong. I got confused from the diagrams at first but then found my wires are numbered on the connector clip!! Nobody mentioned it that lol. Once I found those, following directions like 12-8 is a lot easier to follow. Now if I can just get these out without ruining them..

Also, when I get to the part of adding bigger wire for the fused circuits how will they connect to the tab at the connector?
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Old 06-26-2016, 05:23 PM   #11
stsalvage
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Re: 70 cluster swap to 67 harness?

My only question would be why not just spend the 395.00 and put the 1972 wire harness in.Less chance for a fire or a short.Remember that harness has been in there for well over 40 years.

Its like they say when you buy a new truck or car.Buy the newest modal to get all the latest upgrades.1969--72 use the same harness.If you using gauges.

the only two differences on the 1967-8 to the 69-72 was where the wiper motor plug is.

But all the dashes have the holes for 1967-72 they never changed the metal dash
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Old 06-26-2016, 06:10 PM   #12
soulpedal
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Re: 70 cluster swap to 67 harness?

Because it all worked before, see no bad or melted wires under my dash and dont have that to spend on a swap I got for $40. I already need a new temp gauge $30 sounds better. Not saying a new harness wouldn't improve things just not the time. Vettevet has it figured out and knows whats going on. Just need to see if he will help me thru the wiring.
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