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No Power at Yellow Wire
#992857
05/15/11 02:34 PM
05/15/11 02:34 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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Ok...70 Plymouth B Body
Brand New M & H Main Dash Wire harness.
In the engine compartment I have no power at the yellow wire (start) at the starter rely when I turn the key to the start position.
Inside the car...At the ignition switch harness under the dash I have power at the yellow wire when the key is in the start position.
Inside at the bulkhead I have NO POWER at the yellow wire when the key is in the start position...
Where am I losing power? does the yellow wire go anywhere else?
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Re: No Power at Yellow Wire
[Re: anlauto]
#992858
05/15/11 03:48 PM
05/15/11 03:48 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
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According to the schematic it goes from the ign sw to the bulk head connector..
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: No Power at Yellow Wire
[Re: anlauto]
#992859
05/15/11 03:50 PM
05/15/11 03:50 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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Quote:
Ok...70 Plymouth B Body
Brand New M & H Main Dash Wire harness.
In the engine compartment I have no power at the yellow wire (start) at the starter rely when I turn the key to the start position.
Inside the car...At the ignition switch harness under the dash I have power at the yellow wire when the key is in the start position.Quote:
Looking at the factory service manual the yellow wire (S2-18Y) comes directly off the ignition switch, to the underdash pin connector, then directly to the bulkhead/firewall junction, then straight onto the "I" terminal of the starter relay,....direct path, no deviations/jumpers/splices/etc...
So when you say you have no power "inside" at the bulkhead connector no power, where are you testing at exactly?,...firewall connection, or multi-pin harness connector????????
Mike
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Re: No Power at Yellow Wire
[Re: anlauto]
#992861
05/15/11 03:54 PM
05/15/11 03:54 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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With a test light, I'm checking it at the steering column connector and I have power, then at the inside of the bulk head I don't have power....
I was wondering if it travels anywhere else inside the car, which I don't believe it does...
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Re: No Power at Yellow Wire
[Re: anlauto]
#992862
05/15/11 04:05 PM
05/15/11 04:05 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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Quote:
With a test light, I'm checking it at the steering column connector and I have power, then at the inside of the bulk head I don't have power....
I was wondering if it travels anywhere else inside the car, which I don't believe it does...
OK....either you have a bad connection at the underdash pin connector, or there is a break in the wire from it's path from the pin connector to the firewall/bulkhead connector,....
Have you "stabbed" into the yellow wire with the tip of the tester, directly after the pin connector testing for power with the pin connector ends connected?,....I've seen a few times on the repro harnesses connector pins/clips staked on over the insulation, not making a connection/continuity electrically,....although the M&H harnesses are "tested" before shipping,...I've seen a few "boo-boo's" here and there,....which is wise to test any new/repro harness for continuity with a tester before installing
Mike
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Re: No Power at Yellow Wire
[Re: gtx6970]
#992864
05/15/11 04:27 PM
05/15/11 04:27 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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Ok...I'll try that...
Just now I made a jumper wire to go from the steering column connector to the bulkhead...and everything worked fine, including the clutch pedal switch...
I'll probe the wire as suggested to see if I can test the connection...if not I'm just going to make a permanent jumper wire...
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Re: No Power at Yellow Wire
[Re: 70runner]
#992866
05/15/11 04:43 PM
05/15/11 04:43 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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Ok...
I pricked the yellow wire about 2 inches from the steering column connector...and I have power there meaning that wire connection is OK...
Then a pricked the yellow wire just shy of the inside bulkhead and there's no power there....
So somewhere in this new $500 harness the yellow wire loses power...
Am I correct in assuming the easiest fix would be to make a new yellow wire and run it outside the harness ?
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Re: No Power at Yellow Wire
[Re: anlauto]
#992868
05/15/11 05:17 PM
05/15/11 05:17 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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Quote:
Am I correct in assuming the easiest fix would be to make a new yellow wire and run it outside the harness ?
Yes that would be the "easiest" solution, if you have no intention of pulling the harness,...I would isolate the ends of the non functioning yellow harness wire and test the 2 ends you plan on rendering obsolete for continuity/voltage to be 100% sure that it's just a break somewhere in the wire, rather than a possible short with another circuit
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Re: No Power at Yellow Wire
[Re: NITROUSN]
#992870
05/15/11 06:59 PM
05/15/11 06:59 PM
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Joined: Dec 2007
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Quote:
Could this harness be for a manual transmission with a under dash clutch switch.
The clutch safety switch wiring is between the "G" terminal of the starter relay and the pedal switch,.....Alan's problem is in the yellow lead traveling from the ignition switch to the bulkhead connector, which eventually leads to the "I" terminal on the starter relay, 2 different circuits....
Mike
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Re: No Power at Yellow Wire
[Re: NITROUSN]
#992871
05/15/11 07:04 PM
05/15/11 07:04 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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No the clutch switch is operating correctly. I've made a jumper wire and that circuit is now operating correctly. This car has got ALL new wiring front to back. I've spent 5 hours today with different electrical gremlins... I still have no brake lights or reverse lights...I plan to check the reverse light switch, the next time the car is in the air, but I have no idea on the brake lights yet... I've never in all my years had so many issues... To make matters worse, I'm not too familiar with B Bodies... Thanks for everybody's help  
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Re: No Power at Yellow Wire
[Re: DAYCLONA]
#992872
05/15/11 07:21 PM
05/15/11 07:21 PM
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Joined: Jan 2003
Posts: 18,419
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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Quote:
Quote:
Could this harness be for a manual transmission with a under dash clutch switch.
The clutch safety switch wiring is between the "G" terminal of the starter relay and the pedal switch,.....Alan's problem is in the yellow lead traveling from the ignition switch to the bulkhead connector, which eventually leads to the "I" terminal on the starter relay, 2 different circuits....
Mike
I understand what you are saying. For some reason I thought the relays[key cranking] power was ran through the clutch switch. Have to go out in the shop and look at a manual.
No matter what if he has keyed cranking 12 volts at the yellow wire it has to go somewhere. 
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Re: No Power at Yellow Wire
[Re: anlauto]
#992873
05/15/11 07:21 PM
05/15/11 07:21 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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Quote:
This car has got ALL new wiring front to back.
I still have no brake lights or reverse lights...I plan to check the reverse light switch, the next time the car is in the air, but I have no idea on the brake lights yet...
I've never in all my years had so many issues...
To make matters worse, I'm not too familiar with B Bodies...
B body brake lights, or lack of them,...are a common problem esp on 70's......make sure your grounds located thru-out the car are GOOD, check with a meter for continuity,......have you got turn signals?,.....is the column turnsignal switch/harness new?
Reverse lights are pretty straight forward,......was this car originally automatic?
If original 4 spd, and the back-up harness is new, and checked for continuity,...I'd start with the switch on the tranny, just put the car in reverse and check for continity on the 2 blade ends on the switch,.....I find that some of the repro 4 spd switch plungers don't make contact with the reverse detent,....even if you have to remove the switch to check continuity by manually depressing it, do so, just to eliminate the switch,....so no more chasing electrical ghosts
Mike
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Re: No Power at Yellow Wire
[Re: DAYCLONA]
#992874
05/15/11 07:30 PM
05/15/11 07:30 PM
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Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
anlauto
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Interesting that you mention turn signals... The 4-ways work as they should The left and right turn signals, work as they should... The brake light switch works as it should and has constant power.. I noticed with the key OFF and the turn signal switch on...I get one brake light on the passenger side (not very bright) Are the brake lights wired though the signal light switch? The car is an original 4spd, the transmission harness is included with the positive battery cable (Hemi) As I type this, I just realized I could check those wires where I connected them to the bulkhead  Never thought of that 
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Re: No Power at Yellow Wire
[Re: anlauto]
#992875
05/15/11 10:06 PM
05/15/11 10:06 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
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Quote:
Interesting that you mention turn signals...
The 4-ways work as they should
The left and right turn signals, work as they should...
The brake light switch works as it should and has constant power..
I noticed with the key OFF and the turn signal switch on...I get one brake light on the passenger side (not very bright)
Are the brake lights wired though the signal light switch?
The car is an original 4spd, the transmission harness is included with the positive battery cable (Hemi)
As I type this, I just realized I could check those wires where I connected them to the bulkhead Never thought of that
In a roundabout answer, yes, the brakelight function is dependant on the turn signal switch/harness,....that's why I asked if you've replaced the column turnsignal switch.....70 B bodies are notorious for turn signal/brakelight problems, if you got the old column harness, I would suspect it, if you have one of the "new" Chrysler NORS column harness, I would check it against the FSM diagram,...you'll find the turn signal harness is tied into multiple functions, from the brakelight stop switch, to the glove box light,and a few others in a common harness splice, plus it multiple function of directionals, as well as flashers.......just a FYI, when you buy the next Year One/M&H harness, YO offers some really nice reprints of specific FSM pages covering specific model or year applications, a lot cheaper than buying a FSM for every make/model
When I did my 70 Charger, I replaced ALL the harness, what M&H did not offer, I purchased thru other sources, or NOS,.....My NORS turn signal switch from Chrysler, via Year One, needed to have a few wires rerouted as it was obviously wired wrong when compared to the FSM,.....because of my job vocation, I double/triple/quaddruple check everything before installing any componet, regardless of the manufacturer
Mike 
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Re: No Power at Yellow Wire
[Re: DAYCLONA]
#992876
05/15/11 11:04 PM
05/15/11 11:04 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
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Alan if you have a spare T/S switch try plugging it in, you don't need to install it & an E body switch will work.....
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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