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With the ign. sw in the on position should i have voltage on yellow wire ging to coil

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The ignition switch on a chainsaw operates on a ground. When the switch is "on" the coil is not grounded out, and the magneto can supply power to the coil. When it is "off" the coil is grounded, and no power gets to the coil. If you are checking for spark you can bypass the switch by removing the wire to the coil. It may just be a bad switch. A two stroke motor uses magnets to power the coil through the magneto. If the switch is grounding out there may be no spark!

Posted on Aug 21, 2010

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Posted on Jan 02, 2017

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07 chrysler 300 wont start all lights on dash come on relays engage under hood and in trunk. removed and tested starter. test good. what could c ause this


The ignition switch if what you say about your tests are accurate .
You need a point to start at test the 2 hot wires at the switch for B+they will be large likely yellow wires for 12 volts with the connector disconnected form the ignition switch .
If you have voltage the ign sw is bad if not work your way back to the fuse box because the battery voltage has to come through that box or fuse in that box to get to the switch to start the vehicle its a main power problem 1 of these wires will not have voltage .

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2000 cadillac deville gas gauge avg went blank car won't start


Your best bet is have it checked for DTC'S - diagnostic trouble code's first before doing anything ! Sorry but you have no idea of the complexity of this vehicle .
Body Control System Circuit Description
The body control system consists of three modules, the Dash Integration Module (DIM), the Instrument Panel Integration Module (IPM), and the Rear Integration Module (RIM).
Dash Integration Module (DIM)
Battery Positive Voltage (B+) is provided from IGN SW fuse 20 in the Rear fuse Block on CKT 540 (ORN) to the DIM at connector C3 terminal G. The module ground is on connector C3 terminal E, which is wired to ground G201 by CKT 451 (BLK/WHT). Battery positive sense voltage is provided from DIM fuse 39 in the Rear fuse Block to the DIM at connector C3 terminal A12 on CKT 3340 (ORN). This battery input is referenced to the ground sense input at DIM connector C3 terminal B12, which is wired to the battery negative terminal and to ground G307 on CKT 50 (BLK). These sense inputs are physically connected to the battery positive and negative terminals for accurate battery voltage readings. The DIM is wired to the Class 2 serial data line CKT 1807 (PPL) at connector C2 terminals A11 and A12. The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
Instrument Panel Module (IPM)
Battery Positive Voltage (B+) is provided from I/P fuse 7 in the Underhood fuse Block on CKT 440 (ORN) to the IPM at connector C1 terminal C1. Ignition Positive Voltage (IGN3) is provided from the IGN3 RR fuse 6 in the Rear fuse Block to the IPM on CKT 41 (BRN) at connector C1 terminal C2. The voltage inputs are referenced to the module ground at connector C1 terminal D16 on CKT 451 (BLK/WHT). The IPM is wired to the Class 2 serial data line CKT 1807 (PPL) at connector C1 terminals C7 and C8. The various IPM input and output circuits are described in the corresponding areas as indicated on the IPM electrical schematics.
Rear Integration Module (RIM)
Battery Positive Voltage (B+) is provided from IGN SW fuse 20 in the Rear fuse Block on CKT 540 (ORN) to the RIM at connector C1 terminal A1. Ignition Positive Voltage (IGN1) is provided from IGN1 fuse 12 in the Rear fuse Block on CKT 1039 (PNK) at RIM connector C1 terminal A3. These voltage inputs are referenced to module ground at connector C1 terminals B7 and B8 on CKTs 1051 (BLK). The RIM is wired to the Class 2 serial data line CKT 1807 (PPL) at connector C2 terminals B3 and B4. The various RIM inputs and outputs are described in the corresponding functional areas as indicated on the RIM electrical schematics.

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1 Answer

Keeps blowing "ign. run start


load is measured in amps not ohms.ohms is a measure of resistance in a circuit.check the under side of the pdc for corroded wires or shorted wires on the load side of the circuit.

Apr 20, 2011 | Chrysler Concorde Cars & Trucks

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Im trying to instal my tach on my 99 hyundai accent hatchback witch wire on the coil that i connect too


The "Green" wire from the after-market tachometer will connect to the (-) negative side of the ignition coil.

The "Red" wire from the tachometer will connect to an ignition source that has power only when the key is in the "Run" and "Start" position, usually at a "IGN" source on the fuse panel.

The "Yellow" or "White" wire from the tachometer will connect to the instrument panel lighting fuse in the fuse panel usually marked "LPS" or "IP" and there should be a source next to the instrument panel lighting fuse to connect the wire.

The "Black" wire should be connected to a good body ground, and if the tachometer is not properly grounded anyone sitting in the vehicle while the engine is running will receive a mild electric shock from the ignition coil primary voltage whenever anything metal inside of the vehicle is touched.

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1 Answer

Iam working on a Honda cbr 600 2005. It was running and quit. Ihave repaced the computor and still no fire to the plugs.Have swapped #1 coil with #4 still no fire. The cam sensor appers to have...


Hi and welcome to FixYa,

A couple of initial checks:
  • 2nd 10A fuse in the fuse box;
  • IGN +12 on black/white wires going to the ignition coils;
  • IGN +12 on black wire going to the ignition control module;
  • IGN +12 on black/yellow and black white wires of the engine stop switch;
  • pulsing low AC voltage from the ignition pulse generator (white/yellow and yellow wires);
  • start with the sidestand folded up and/or the clutch pulled in.

Good luck and thank you for asking FixYa.

Jan 05, 2010 | 2000 Honda CBR 600 F(4)Y

2 Answers

Have no spark. Changed coil & CDI box so far. still no spark. Is it the internal coil? 1989 enticer 400T/R


Hi and welcome to FixYa,
Initially, suggested checks on the wires:
  • black of igniter unit tied to ground;
  • orange wire from igniter to ignition coil with pulsating voltage when starting;
  • gray wire from igniter to ignition coil with pulsating voltage when starting;
  • IGN + 12 on red/white wire to igniter and ignition coils from engine stop switch;
  • IGN + 12 on red/white wire to engine stop switch coming from 10Amp ignition fuse;
  • pulsating low voltage from pickup coil between the wires black/white, white/green & yellow/red.
Postback results of above voltage tests.
Good luck and thank you for asking FixYa. Happy Holidays.

Dec 15, 2009 | 1987 Yamaha XS 400 DOHC

1 Answer

1987 Honda shadow vt1100c no spark at any plug


The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.

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1 Answer

87 regal ignition switch wiring diagram


Thick wires at IGN SW .... Red(s) - supply power from the battery to the IGN switch ... Pink - ignition supply ... Orange - Accessory power ... Purple most RWD sometimes (Yellow most FWD) - Starter .. Did I miss any? It's been a while The thin wires on the IGN swich are for key sense and VATS (if applicable)

May 08, 2009 | 1987 Buick Regal

1 Answer

Gsxr 750 no spark how do i test cdi


I've this data from my 1986 engine!

Under the left hand side cover there are 2 2-wire connections. One with a green and a black wire, one with a blue and a yellow wire.
Use an ohmmeter at R x 100 between both wires of a connector to check the pick-up coils: resistance must be between 130 and 180 Ohms.

The values of the ignition coil resistances are:
primary coil : 3-5ohms ( set ohmmeter at R x 1 )
Secundary coil : 25.000 - 45.000 ohms ( set ohmmeter at R x 1.000 )
For a correct measurement ALL leads must be disconnected ( also the spark plug leads )

The CDI cannot be tested with a simple measurement. Suzuki dealers have a special tool to test CDI boxes.
But checking the pick-up coils and ignition coils good will indicate an defective CDI.

The wires on the CDI:
Blue: PU coil 1 ( cyl 1-4 )
Yellow: PU coil 1
Green: PU coil 2 ( cyl 2-3 )
Blue : PU coil 2
Orange/white : +12v ign coil 1-4
White : switched coil negative side ign coil 1-4
Orange/white : +12v ign coil 2-3
Blue/yellow: switched coil negative side ign coil 1-4 ( and signal to tachometer )
Blue/white : ground

Thus, you must have +12V on both Orange/white leads.

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