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02-07-2012, 11:18 PM | #1 |
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Join Date: Jan 2008
Location: Eureka Springs AR
Posts: 179
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Factory tach help please
Could someone please show me where on the firewall the wire that goes to the dist for a factory tach goes through the firewall on a 1978 era truck. I think it is near where the accelerator pedal bolts to the firewall but not real sure.
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02-08-2012, 01:12 PM | #2 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Factory tach help please
i would think it would be "in" the harness going to the engine
I added one to mine(harness),have yet to hook it up. just a temp wire for now
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
02-08-2012, 06:48 PM | #3 | |
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Location: Wentworth, NH
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Re: Factory tach help please
Quote:
Not sure where the stock location is though. The heater wiring, 4 speed backup lights and, TH400 kickdown wires do this as well. |
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02-08-2012, 08:04 PM | #4 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
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Re: Factory tach help please
oh then the man to ask woud be Keith
actually his truck has one may spot it in his thread http://67-72chevytrucks.com/vboard/s...342926&page=25 i know mine came with the right plug/harness,and it was seperate
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
02-08-2012, 11:10 PM | #5 |
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Location: Portland, OR
Posts: 15
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Re: Factory tach help please
I have a 78 that I ordered with the factory tach. It took me a while to trace the wire and this is what I found. Starting at the distributor the wire (brown) goes to a resistor on the firewall just left of center, then it goes into a split wire loom as it continues to travel to the left side of the truck. At the end of the loom it turns downward just below the backside of the fuse panel assembly and "yes" it does go through the firewall in it's own grommet by itself. From inside the cab you will see a bundle of wires just below the fuse panel and about 1 1/4" to the right of that bundle is where the wire comes through.
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02-09-2012, 03:13 AM | #6 |
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Join Date: Jan 2008
Location: Eureka Springs AR
Posts: 179
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Re: Factory tach help please
Thats it! Thanks for the pic billybobjimmyjoejack and everyone else. Now I have to figure out where the orange kickdown wire for a turbo 400 goes through the firewall.
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02-09-2012, 08:37 AM | #7 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Factory tach help please
hmm good to know,explains why the tach/brown insulation seemed so thick
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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